The Geometry Seminar at IME-USP  during the years of  2013-2018 were  organized by Prof. Marcos Alexandrino and Prof. Paolo Piccione and  supported by Projeto Temático-Fapesp of Prof.  Paolo Piccione ( Fapesp 2016/23746-6/Fapesp: 2011/21362-2)

• march 5,   2020 at 16h
• Title:  Geometria trasversa de folheações Riemannianas via deformações
  
• Speaker: Prof. Francisco Caramello 
• Abstract: Veremos generalizações de alguns resultados da geometria Riemanniana clássica para a
  geometria transversa de folheações de Killing, obtidos por uma técnica de deformação que permite
  a redução desse tipo de resultado para o caso de orbifolds Riemannianos. Estes resultados são
  parte de um trabalho desenvolvido em parceria com Prof. Dr. Dirk Töben (DM-UFSCar).
  
• venue:  A268  (IME-USP) 

• march 12,   2020 at 11h
• Title:  Nijenhuis Geometry: singularities and global issues.
  
• Speaker:  Prof. Vladimir Matveev
• Abstract: The talk is devoted to Nijenhuis operators, i.e., fields of
    endomorphisms with vanishing Nijenhuis torsion. This is possibly the simplest geometric
    condition; for this reason it  appears independently and   many times in
    geometry, analysis and mathematical physics, in particular in the theory of
    projectively equivalent metrics and in the theory of integrable systems.
    The talk is based on a series of papers in progress  aiming at re-directing
    the research agenda in this area to “next level topics":
    • Singular points: what does it mean for a point to be generic or singular
    in the context of Nijenhuis geometry? What singularities are
    non-degenerate? What singularities are stable? How do Nijenhuis operators
    behave near non-degenerate and stable singular points?
    • Global properties: what restrictions on a Nijenhuis operator are imposed
   by compactness of the manifold? And conversely, what are topological
    obstructions on a manifold carrying a Nijenhuis operator with specific
    properties (e.g.with no singular points) ? 
    We demonstrate that this research program is realistic by proving a series
    open problems some of which are easy to formulate.
  
• venue: 249-A  (IME-USP) 

• march 13,   2020 at 14h
• Title: 
  
• Speaker: Prof Andrea Loi  ( Universidade de Cagliari-Italia )
• Abstract: 
  
• venue:   (IME-USP) 

• December, 20   2019 at 16h
• Title: Convex Algebraic Geometry of Curvature Operators
  
• Speaker: Prof. Renato Bettiol (  Cuny EUA)
• Abstract: I will discuss the structure of the set of algebraic curvature operators of n-dimensional Riemannian manifolds satisfying a sectional curvature bound (e.g., nonnegative or nonpositive sectional curvature), under the light of the emerging field of Convex Algebraic Geometry. More precisely, we completely determine in what dimensions n this convex semi-algebraic set is a spectrahedron or a spectrahedral shadow (these are generalizations of polyhedra where linear programing extends to as semidefinite programming, and are of great interest in applied mathematics and optimization). Furthermore, if n=4, we describe this set as an algebraic interior with respect to an explicit irreducible polynomial.
  This is based on joint work with M. Kummer (TU Berlin) and R. Mendes (Univ of Oklahoma).
  
• venue:  266-A (IME-USP) 

• Dezember 05, 2019 (SP Geometry Seminar at Unicamp):  Prof. Llohann Dallagnol Sperança (Unifesp)
• Dezember 05, 2019 (SP Geometry Seminar at Unicamp): Prof. Alexandre Paiva(UFScar)
• Dezember 05, 2019 (SP Geometry Seminar at Unicamp):  Hugo Cattarucci Botós (ICMC) -short presentation
• Dezember 05, 2019 (SP Geometry Seminar at Unicamp): Jackeline Conrado (USP)-short presentation

• November  29, 2019 at 14h
• Title: Produtos torcidos com curvatura harmônica sobre superfícies" (trabalho em colaboração com Paolo Piccione)
  
• Speaker:  Prof. Andrzej Derdzinski (Ohio-state)
• Abstract:Uma variedade riemanniana é dita  ter curvatura harmônica se a divergência do seu tensor de curvatura é nula (ou,equivalentemente, o​ seu tensor de Ricci satisfaz à equação de Codazzi). Nós descrevemos a estrutura local das variedades riemannianas de dimensões​ $n>3\,$ que, além de possuir curvatura harmônica, admitem​
  decomposições  não triviais como produto torcido com bases bidimensionais.​ A descrição, expressa em termos da função torção  $\phi$ e​ da métrica  $\,g=\phi^{-\nh2}\nh h\,$ conforme á métrica da base $h$,​ envolve uma dicotomia natural: ou $g$ tem curvatura Gaussiana $K$​ constante, ou $K$ é  não constante e igual a uma função​ específica da função torção $\phi$. Em ambos os casos​ $\phi$ satisfaz a uma equação diferencial quase-linear​ elíptica da segunda ordem.​ Construímos também exemplos ilustrando que ambos os casos acima são​ realizados por variedades compactas. 
  

• November  29, 2019 at 15h
• Title: Formal integrability of geometric structures
  
• Speaker:  Francesco Cattafi (Utrecht University)
• Abstract: A Lie pseudogroup $\Gamma$ is a collection of locally defined diffeomorphisms arising as solutions of a PDE.
  This object gives rise to the notion of $\Gamma$-structure on a manifold $M$:
  it is a maximal atlas whose changes of coordinates take values in $\Gamma$.
  For instance, the set of local symplectomorphisms of the canonical symplectic structure of
  $\mathbb{R}^{2n}$ forms a Lie pseudogroup, and the associated $\Gamma$-structure
  is a symplectic structure on $M$. More generally, any integrable $G$-structure is a special kind of $\Gamma$-structure.
  This leads us to a natural question: what is the counterpart of a non-integrable $G$-structure in the Lie pseudogroup world
  (which we call "almost $\Gamma$-structure")? And when does an almost $\Gamma$-structure come from a $\Gamma$-structure? In this talk we are going to review these notions and provide an answer to the questions sketched above. In particular, we present a new characterisation of formal integrability  in the setting of $\Gamma$-structures; this will be obtained by introducing the concept of principal  Pfaffian bundle and studying its prolongations to higher orders; we draw inspiration from similar results for PDEs on jet bundles and for $G$-structures, which we are going to recover. This is joint work with Marius Crainic.
   

• Short Lectures: 
• November  26,27,28,  2019 at 14h
• Title: An introduction to Lie pseudgroups and Geometric Structures
  
• Speaker:  Francesco Cattafi (Utrecht University)
• venue:165B (IME-USP)
• Abstract: In this minicourse I aim to present a general theory of geometric structures described by a Lie pseudogroup and to study the related integrability problem. 
• Lecture 1 - The problem: integrability of almost structures
  
• Lecture 2 - The tools: principal Pfaffian bundles
  
• Lecture 3 - The solution: prolongations and intrinsic torsions
  
  

• November  22, 2019 at 15:15h
• Title: The behavior of basic equivariant cohomology of Killing foliations under deformations.
  
• Speaker:  Dr. Francisco Caramello (IME-USP)
• Abstract: Killing foliations form an important class of Riemannian foliations which includes foliations given by orbits of isometric actions and Riemannian foliations on simply connected manifolds.  Such foliations have a built-in action of a Lie algebra of Killing vector fields whose orbits are the closures of the leaves. It is then natural and relevant to study the basic equivariant cohomology (with respect to this action) of those foliations. On the other hand, we’ve obtained recently a deformation technique for Killing foliations which allows one to reduce many aspects of their study to the geometry and topology of orbifolds. In this talk we will see that the ring structure of basic equivariant cohomology is preserved throughout those deformations and, as a consequence, coincides with equivariant cohomology of an orbifold , with respect to a torus action. As an application, we’ll give an algebraic condition for the basic Betti numbers to remain constant thoughout deformations.
  

• Preliminary talk of 2nd Workwhop of the  São Paulo Journal of Mathematical Science
• November  11, 2019 at 14:00h
• Title: A "promenade" towards energy an volume of unit vector fields.
  
• Speaker:  Prof.  Fabiano Brito
• Abstract: We present results on the subject in the title. The general goal is to tell about "interesting " minimizations of the volume and energy functional for unit flows . Most of the subject is in relation to previous or future papers written or to be written in collaboration with the following co authors:P. Walczak,A. Naveira,P. Chacon,O. Gil Medrano,V. Borrelli R. Mesquita, A. Gomes,G. Nunes ,  I. Gonçalves. A. Nicoli,J. Conrado .This order is  intended to be  chronological according to date of publications( or  expected future ones)
  
• venue: 243-A (IME-USP) 

• Event: 2nd Workwhop of the  São Paulo Journal of Mathematical Science: Jean-Louis Koszul in São Paulo, His Work and Legacy
•  November 13-14, 2019 
• https://www.ime.usp.br/~2wspjm/

• SP Geometry Seminar
• November  8, 2019 at 14.00h
• Title: Existence Defects of Geometric Structures
  
• Speaker: Prof. Michel Nguiffo Boyom (Alexander Grothendieck Research Institute, University of Montpellier, France.)
• Abstract:  Let $S) be a type of Geometric structure. A smooth manifold $M$ is called a $S$-manifold when it is equipped with a structure of type $S$. A foliation the leaves of which are smoothly $S$-manifolds is called a foliation of type $S$, ( the notion of $S$-foliation might carry another meaning.) Given a smooth manifold $M$, let $S$ be a type of Geometric structure. Arises the question whether $M$ can support a foliation of type $S$. That is a rather hard problem in the differential topology. The aim is to point out that for many important types of Geometry structures this existence problem is linked with sheaves of associative algebras of solutions of Hessian equations defined by Koszul connections in the tangent bundle $TM$. The talk is devoted to overview a few cases of geometric structures which have significant impacts on other research domains. Instances are Hessian structures in Riemannian manifolds; Hessian structures in locally flat manifolds; symplectic structure in manifolds; left invariant symplectic structure in Lie groups.
  
• venue: Auditório Jacy Monteiro (IME-USP) 



• SP Geometry Seminar
• November  8, 2019 at 15.00h
• Title: On the spectrum of warped products and $G$-manifolds
  
• Speaker:  Prof. Marcus Marrocos (UFABC)
• Abstract: see links
  
• venue: Auditório Jacy Monteiro   (IME-USP) 



• SP Geometry Seminar- short presentation
• November  8, 2019 at 16.30h
• Title: A semi-local model for singular Riemannian foliations.
  
• Speaker:  Marcelo Inagaki (USP)
• Abstract: In this talk we present a semi-local model for a singular Riemannian foliation $\mathcal{F}$. More precisely, in a distinguish tubular neighbourhood, the first order approximation of $F$ (linearized foliation $\mathcal{F}^\ell$) wich partially describes the dynamic of $\mathcal{F}$ will be given by the action of a Lie groupoid. Moreover $\mathcal{F}$ and $\mathcal{F}^\ell$ will be foliated diffeomorphic to a generalization of the holonomy foliation and his linearization, respectivelly. This talk is based on joint work with prof. Marcos Alexandrino (IME-USP) and prof. Ivan Struchiner (IME-USP).
  
• venue: Auditório Jacy Monteiro (IME-USP) 




• SP Geometry Seminar- short presentation
• November  8, 2019 at 17:00h
• Title: Moduli space of contact Instantons in $7$-dimensions
  
• Speaker:  Luiz Portilla (IMECC)-
• Abstract: see link
  
• venue: Auditório Jacy Monteiro (IME-USP) 

• October  18, 2019 at 15.15h
• Title: Cheeger deformations and Positive Ricci and Scalar curvatures
  
• Speaker: Leonardo F. Cavenaghi (IME-USP)
• Abstract: Let $(M,g)$ be a compact Riemannian manifold with an isometric $G$-action. If a principal orbit has finite fundamental group and the quotient space has a metric with positive Ricci curvature, then Searle and Wilhelm showed that $M$ carries a $G$-invariant metric of positive Ricci curvature. To do so, they make use of a conformal change on the original metric and Cheeger deformations. The question remained whether Cheeger deformations are sufficient to prove the Theorem. In this short talk we discuss how to approach this question studying the tensors associated to Cheeger deformations on singular points of the action. We both construct examples where the Cheeger deformation is not enough and give sufficient (algebraic) conditions where the deformation is enough. Once understood the geometry near singular points, we show that provided $G$ is non-abelian, any $G$--invariant metric develops positive scalar curvature after a finite Cheeger deformation. This is a joint work with Renato J.M. e Silva and Llohann D. Sperança.
  

• October  18, 2019 at 15.40h
• Title: A topological lower bound for the energy of a unit vector field on a closed euclidean hypersurface
  
• Speaker: Adriana Vietmeier Nicoli (IME-USP)
• Abstract: For a unit vector field on a closed immersed Euclidean hypersurface $M^{2n+1}$ , $n ≥ 1$, we exhibit a nontrivial lower bound for its energy which depends on the degree of the Gauss map of the immersion. When the hypersurface is the unit sphere  $S^{2n+1}$, immersed with degree one, this lower bound corresponds to a well established value from the literature. We introduce a list of functionals $B_k$ on a compact Riemannian manifold $M^m$, $1 ≤ k ≤ m$, and show that, when the underlying manifold is a closed hypersurface, these functionals possess similar properties regarding the degree of the immersion. In addition, we prove that Hopf flows minimize $B_n$ on $S^{2n+1} .
  This is a joint work with Fabiano G. B. Brito and Ícaro Gonçalves.
   

• October  4, 2019 at 14h
• Title: On Mean curvature flow of Singular Riemannian foliations: Non compact cases..
  
• Speaker: Prof. Marcos Alexandrino (IME-USP)
• Abstract:In this talk we discuss  the  mean curvature flow (MCF) of a regular leaf of a closed generalized isoparametric foliation as initial datum, generalizing previous results of Radeschi and first author. We show that, under bounded curvature conditions,  any finite time singularity is a singular leaf, and the singularity is of type I. We also discuss the existence of  basins of attraction, how cylinder structures can affect convergence of basic MCF of immersed submanifolds and  make a few remarks  on MCF of non closed leaves of generalized isoparametric foliation.
  This talk is based on a joint work with  Leonardo F. Cavenaghi, Icaro Gonçalves

• September  20, 2019 at 14h
• Title: Projectively induced Ricci-flat Kaehler metrics.
  
• Speaker: Prof. Michela Zedda
• Abstract:The first part of this talk gives an overview of the problem of classifying Kaehler-Einstein manifolds which admit a Kaehler immersion into the complex projective space, which leads to the conjecture that the only Ricci-flat projectively induced Kaehler metric is the flat one. In the second part, we give evidence to this conjecture for the Calabi's Ricci-flat metrics on holomorphic line bundles over compact Kaehler-Einstein manifolds.
  
• venue: 259-A (IME)

• August  23, 2019 at 16h
• Title: The analysis of the Ricci flow on compact manifolds
  
• Speaker: Adam Rudnik
• Abstract:In this talk I will present DeTurck’s proof of the existence and uniqueness of the Ricci flow on compact manifolds.
  I will then briefly talk about a condition to the long time existence of the Ricci flow. In the last part
  I will present what is known in the case of compact, orientable 2-dimensional manifolds.
• venue: 268-A  (IME)

• August  30, 2019 at 14h
• Title: Widths and volumes of three-spheres
  
• Speaker: Prof. Lucas Ambrozio
• Abstract: Simon and Smith have shown that every Riemannian  three-dimensional sphere contains an embedded minimal two-sphere by  implementing a min-max procedure for the area functional in the space  of embedded two-spheres. Such procedure actually defines a geometric  invariant as well, which we call 'width'. In this talk, we will  discuss results that compare the width to other geometric invariants  of Riemannian thee-spheres, e.g. the total volume. In particular, we  
  prove a sharp inequality between widths and volumes that characterise  the canonical metric, and show that equidistribution of minimal  two-spheres of bounded index and area is a phenomenon associated to  local maxima of the width among unit volume metrics in a given  conformal class. This is joint work with Rafael Montezuma.
• venue: 268-A (IME)

• August  15, 2019 at 14h
• Title: Função Transnormal Finsleriana
  
• Speaker: Prof. Benigno Alves (UFBA)
• Abstract: Nesta palestra apresentaremos o conceito e algumas propriedades de função Transnormal Finsleriana que é uma generalização da função distância. Quando tal função é analítica com fibras conexas definida em uma variedade Finsler compacta, seus níveis são subvariedades equidistantes, em particular, constituem uma folheação Finsleriana singular.
  Por fim apresentaremos condições que garantem a existência de uma métrica Riemanniana tal que a função em questão é transnormal Riemanniana. Tal apresentação é baseada em trabalho conjunto com Prof. M. Alexandrino e Profa  H. R. Dehkordi,
• venue: 101B (IME)

• August  15, 2019 at 15h
• Title: Submanifold Theory of Finsler manifolds
  
• Speaker: Prof. Miguel Angel Javaloyes (Murcia-Spain)
• Abstract: In this talk, we will describe basic results in the theory of submanifolds of Finsler manifolds. First, we will give some tools needed for this study. In particular, we will show that it is possible to define a Levi-Civita anisotropic connection associated with a Finsler metric. We will also show how to define the derivative of an anisotropic tensor (a tensor which depends on the direction rather than on the points of the manifold) and how to define the curvature tensor of an anisotropic connection, giving some results as Bianchi Identities and formulas relating the curvature of two different anisotropic connections. Next, we will study the curves that minimize the distance to a submanifold, showing that locally orthogonal geodesics are minimizers and that in fact, there exist tubular neighbourhoods of precompact submanifolds. This result is crucial for the study of singular Finsler foliations. Afterwards, we will study the Gauss equation of a submanifold and we will finish the talk speaking briefly about minimal submanifolds and the embedding problem.
• venue: 101B (IME)

• August  16, 2019 at 14h
• Title: Estimativas para o primeiro autovalor do operador Laplaciano Aproximado
  
• Speaker: Prof Giovanni Nunes
• Abstract: see link
• venue: 101B  (IME)

• August  16, 2019 at 15h
• Title: Invariant theory for real reductive representations
  
• Speaker: Prof. Leonardo Biliotti (Parma-Italy)
• Abstract:  Let G be a connected real reductive Lie group acting linearly on a finite dimensional vector space V over R. This action admits a Kempf-Ness function and so we have an associated gradient map. If G is Abelian we explicitly compute the image of G orbits under the gradient map, generalizing a result proved by Kac and Peterson in the complex setting. We also give  a new proof of the Hilbert-Mumford criterion and the Kempf-Ness Theorem  for real reductive Lie groups avoiding any algebraic result. Finally we investigate the natural G action on the projective space P(V) and we discuss some new results wich are still in working in progress.
  
• venue: 101B  (IME)

• USP-UNICAMP Geometry Seminar 321 (IMECC).
• June 27, 2019 : 14:00 - 15:00
• Title:  Anosov actions which are affine
  
• Speaker: Dr. Uirá Norberto Matos de Almeida (pos-doc IME-USP)
• Abstract: http://www.ime.unicamp.br/~geodif/index.html

• USP-UNICAMP Geometry Seminar 321 (IMECC).
• June 27, 2019 : 15h-15:30h
• Title:  Bifurcation and Local Rigidity of Homogeneous Solutions to the Yamabe Problem on Maximal Flag Manifolds
  
• Speaker: Kennerson Nascimento de Sousa Lima -UNICAMP
• Abstract: http://www.ime.unicamp.br/~geodif/index.html

• USP-UNICAMP Geometry Seminar 321 (IMECC).
• June 27, 2019 : 15:45h-16:45h,
• Title: Gap de energia em teoria de Yang-Mills para variedades completas com invariante de Yamabe positivo
  
• Speaker: Prof Matheus Vieira (UFES)
• Abstract: http://www.ime.unicamp.br/~geodif/index.html

• June 28, 2019 at 14h
• Title:  Lie groupoids and semi-local models of Singular Riemannian foliations
  
• Speaker: Marcos Alexandrino (IME-USP)
• Abstract:  In a previous paper, Radeschi and Alexandrino, proved the conjecture of Molino that for every singular Riemannian foliation (M,F), the partition given by the closures of the leaves of F is again a singular Riemannian foliation. For that they studied the linearized subfoliation of F that roughly speaking describe the semi-local dynamical behavior of F.
  In this talk we define a Lie groupoid whose orbits are the leaves of the linearized subfoliation and review the semi-local models of Singular Riemannian foliations. This talk is based on a joint work with  Marcelo K. Inagaki (IME-USP) and prof. Ivan Struchiner (IME-USP).
  
• venue: B-138 (IME)

• June 19, 2019 at 14h
• Title:   Ações aleatórias na Esfera de Riemann
  
• Speaker: Lucas Kaufmann Sacchetto (Paris 6)
• Abstract:  Os automorfismos da Esfera de Riemann são representados por matrizes em SL_2(C), que agem por meio de transformações de Möbius. Considere o seguinte problema: dadas duas matrizes A e B em SL_2(C), o que podemos dizer sobre a ação de produtos da forma …AABABBBABA onde A e B são escolhidos aleatoriamente e o número de matrizes tende ao infinito? Esse problema e seus variantes remontam aos anos 60 com o trabalho pioneiro de Furstenberg. Mesmo depois de muitos avanços realizados nos anos 70 e 80, o assunto continua a despertar interesse até os dias de hoje e respostas definitivas a algumas questões foram dadas apenas recentemente. O plano dessa palestra será apresentar alguns resultados básicos dessa teoria e mostrar como podemos olhar para o problema sob o ponto de vista da Dinâmica Holomorfa.

• May 24, 2019 at 15h-16h
• Title:  Anosov actions which are affine
  
• Speaker: Dr Uirá Norberto Matos de Almeida (IME-USP)
• Abstract:  There exists a standing conjecture that higher ranked abelian Anosov actions are always algebraic.
  This conjecture does not hold true for generic Anosov flows, however, it is known that in the presence
  of some additional geometric conditions, it is possible to show the ”algebraicity” of this flows.
  Motivated by this, we proposed the study of Anosov actions with some additional geometrical conditions.
  In this talk, we present some conditions under which a higher ranked abelian Anosov action is conjugated to
  an affine action of $\mathbb{R}^k$ on a homogeneous space $\Gamma \backslash G \slash H$.
  We put the non-specialized public at ease and assure you that basic concepts will be recalled and this talk is direct to the mathematical public at large.
  

• USP-UNICAMP Geometry Seminar (at IME USP)
• May 17, 2019 at 14h-15h
• Title: Hipersuperfícies mínimas em $S^5$ com curvatura escalar e função simétrica elementar $\sigma_3$ constantes
  
• Speaker: prof. Luiz Amancio Machado de Sousa Junior
• Abstract: vide link
  
• venue: B4 (IME)

• USP-UNICAMP Geometry Seminar (at IME USP)
• May 17, 2019 at 15h-16h
• Title: ACTIONS ON POSITIVELY CURVED MANIFOLDS AND BOUNDARY IN THE ORBIT SPACE
  
• Speaker: prof. Claudio Gorodski (IME-USP)
• Abstract:    We study isometric actions of compact Lie groups on complete orientable positively curved n-manifolds whose orbit space has non-empty boundary in the sense of Alexandrov geometry and prove that for sufficiently large
  n (in terms of the Lie group), either the group has a fixed point, or a normal subgroup thereof, containing all isotropy groups associated to boundary strata, has a fixed point. Among our applications, we classify representations of simple Lie groups whose orbit space has non-empty boundary. (joint work with A. Kollross and B. Wilking).
  
• venue: B4 (IME)

• USP-UNICAMP Geometry Seminar (at IME USP)
• May 17, 2019 at 16:30h-17h
• Title: T-duality and mirror symmetry on nilmanifolds (Short Communications)
  
• Speaker:Dr Leonardo Soriani (UNICAMP)
• Abstract: opological T-duality can be undestood as a Courant algebroid isomorphism. This allows one to transport generalized complex structures between T-dual spaces. Sometimes this transport has a mirror symmetric behaviour, that is,
  it transports a symplectic structure to a complex one. We show that this phenomena translates very well into a Lie algebraic setting, yielding the notion of infinitesimal duality, Under reasonable assumptions, infinitesimal duality of nilpotent Lie algebras can be upgraded to actual T-duality on corresponding nilmanifolds. We also show how this machinery is used to transport generalized complex branes between T-duals.
  
• venue: B3 (IME)

• USP-UNICAMP Geometry Seminar (at IME USP)
• May 17, 2019 at 170h-17:30h
• Title: A topological lower bound for the energy of a unit vector fieeld on closed Euclidean hypersurfaces (Short Communications)
  
• Speaker: Adriana Nicolli (IME-USP)
• Abstract:    see Link
  
• venue: B3 (IME)

• May 10, 2019 at 14h-16h
• Title: Métricas maximamente torcidas de curvatura harmônica
  
• Speaker: Prof. Andrzej Derdzinski (The Ohio State University)
• Abstract:    Uma variedade riemanniana  é dita de ter curvatura harmônicas e a divergência do seu tensor de curvatura  é nula (ou, o que  é o mesmo, o seu tensor de Ricci satisfaz  `a equação de Codazzi). Nós descrevemos a estrutura local das variedades riemannianas de dimensões n  > 2 que, al ém de possuir curvatura harmônica, admitem o número máximo, em um sentido bem definido, de decomposições produto torcido locais e, ao mesmo tempo, em algum ponto, seu tensor de Ricci tem n autovalores distintos. Mostramos também que em cada dimensão n  > 2 fixa, os tipos de isometria local de tais variedades formam um espaço de módulos de dimens~ao finita, e que um subconjunto aberto não
  vazio deste espaço é realizado por m étricas completas.
  (trabalho em colaboração com Paolo Piccione)

• March 22, 2019 at 14h
• Title: Critérios de solubilidade de tipo Serrin para problemas de Dirichlet para equações de curvatura média pré-determinada em variedades
  
• Speaker: Dra. Yunelsy Napoles Alvarez (Puc-rio)
• Abstract:    Neste seminário apresentaremos novos resultados de não existência e de existência de gráficos verticais no produto MxR com curvatura média pré-determinada H=H(x,z), onde M é uma variedade completa de dimensão n. Como consequência de tais resultados se derivam critérios de solubilidade sharp para o problema de Dirichlet para a equação vertical da curvatura média H em MxR. Esses resultados generalizam resultados clássicos de Jenkins-Serrin e de Serrin no ambiente Euclidiano, bem como resultados de Spruck no contexto MxR.
  
• venue: 241-A(IME)

• March 22, 2019 at 14h
• Title: Critérios de solubilidade de tipo Serrin para problemas de Dirichlet para equações de curvatura média pré-determinada em variedades
  
• Speaker: Dra. Yunelsy Napoles Alvarez (Puc-rio)
• Abstract:    Neste seminário apresentaremos novos resultados de não existência e de existência de gráficos verticais no produto MxR com curvatura média pré-determinada H=H(x,z), onde M é uma variedade completa de dimensão n. Como consequência de tais resultados se derivam critérios de solubilidade sharp para o problema de Dirichlet para a equação vertical da curvatura média H em MxR. Esses resultados generalizam resultados clássicos de Jenkins-Serrin e de Serrin no ambiente Euclidiano, bem como resultados de Spruck no contexto MxR.

• March 15, 2019 at 14h
• Title: Genuine infinitesimal bendings of Euclidean submanifolds 
  
• Speaker: Miguel Ibieta Jiménez (IMPA)
• Abstract:  In this talk we focus on a notion of bending of a submanifold. This notion is associated to variations of a submanifold by immersions that preserve lengths ``up to the first order". More precisely, an infinitesimal bending of an isometric immersion $f:M^n \to \mathbb{R}^{n+p}$ is the variational vector field associated to
  a variation of $f=f_0$ by immersions $f_t$  whose induced metrics $g_t$ satisfy $g'_t(0)=0$.  We present some results concerning genuine infinitesimal bendings of submanifolds in low codimension. That an infinitesimal bending is genuine means that it is not determined by an infinitesimal bending of a submanifold of larger dimension. We show that a strong local condition for a submanifold to be genuinely infinitesimally bendable is to be ruled and we estimate the dimension of the rulings. We also describe the situation for infinitesimal bendings of compact submanifolds in codimension $2$. Finally, we give a description of the complete Euclidean hypersurfaces that are infinitesimally bendable. 

• USP-UNICAMP Geometry Seminar (at IME USP)
• November 29, 2018 at 14h
• Title: Resolvent trace asymptotics on singular spaces   
  
• Speaker: prof. Luiz Hartmann (UFSCar)
• Abstract:  In his seminal work ``Spectral Geometry of Singular Riemannian Spaces'', Jeff  Cheeger started an influential program on spectral analysis on stratified spaces with singular Riemannian metrics. The ultimate goal of the program is
  to establish resolvent trace asymptotics in this very general setting. We propose to discuss the development of Cheeger's program until the recent days

• USP-UNICAMP Geometry Seminar (at IME USP)
• November 29, 2018 at 15.10h
• Title: Spin(7)-instantons e fibrados de Higgs  
  
• Speaker: Pedro Manfrim
• Abstract:  Um dos interesses da teoria de calibre em dimensão superior é estender, para holonomia especial, o resultados obtidos em dimensão baixa. No caso de Spin(7), isso nos leva a estudar os Spin(7)-instantons que são mínimos do funcional de Yang-Mills. Após uma breve introdução a esses instantons, eu mostrarei como podemos obter, por redução dimensional, exemplos de instantons a partir de fibrados de Higgs. Caso haja tempo, explicarei como tal construção pode ser usada para obter instantons sobre somas conexas torcidas.

• USP-UNICAMP Geometry Seminar (at IME USP)
• November 29, 2018 at 15.45h
• Title: Log-term of the Bergman kernel and Szegö kernel of the disc bundle over polarised manifold
  
• Speaker:prof.  Roberto Mossa (USP)
• Abstract:  In this seminar we present the results on the vanishing of the log-term on the Fefferman expansion of the Bergmann kernel of the disc bundle over a homogeneous Kahler manifold obtained on Ann. Global Anal. Geom. (2017) in collaboration with A. Loi and F. Zuddas. As well as some new results on the vanishing of the log term of the Szegö kernel of the corresponding unit circle bundle. These results are related to the classical Ramadanov conjecture and are inspired by the work of Z. Lu and G. Tian (Duke Math. J. 125:351-387, 2004). In particular this results confirm the conjecture of Lu according to which the coefficients a_k of the Tian-Yau-Zelditch expansion of the Kempf distortion function, vanish for k > n if and only if the log-term of the Szegö kernel vanishes.

• USP-UNICAMP Geometry Seminar(at IME USP)
• November 29, 2018 at 16.50h
• Title: On the Balanced condition for the Eguchi-Hanson and Simanca metrics.
  
• Speaker:  Francesco Cannas Aghedu
• Abstract:  vide pdf.

• November 30, 2018 at 14.00h
• Title: Estimativas do índice de Morse de  hipersuperfícies CMC fechadas em S^5 pelo segundo número de Betti.
  
• Speaker:prof.  Darlan Ferreira de Oliveira (Universidade Estadual de Feira de Santana)
  
• Abstract: Neste seminário, provaremos uma estimativa para o índice de Morse para superfícies CMC fechadas imersas
  em espaços de curvatura seccional não negativa pelo primeiro número de Betti.  Em seguida, mostraremos como adaptar a técnica utilizada  para superfícies para obter  uma estimativa para o índice de Morse de hipersuperfícies CMC
  fechadas imersas em S^5 pelo segundo número de Betti.

• November 23, 2018 at 14h
• Title:  Rigidez topológica para hipersuperfícies de formas espaciais esféricas
• Speaker: Eduardo Longa
• Abstract:  Apresentarei um resultado de rigidez topológica para hipersuperfícies fechadas da esfera euclidiana
  e de formas espacias esféricas. Sob uma certa cota inferior para o valor absoluto das curvaturas principais da
  hipersuperfície, provamos que ela é difeomorfa a uma esfera ou a um quociente da esfera por uma ação de um
  grupo. Provaremos também outro resultado sobre hipersuperfícies fechadas da esfera, que leva em consideração
  a imagem de sua aplicação de Gauss. 

• November 5-9, 2018 GAAG — IV, Geometry in Algebra and Algebra in Geometry IV, IME-USP,  

• October 26, 2018
• Title:  Balanced metrics on the blow-up of C2 at the origin
• Speaker:  Francesco Cannas Aghedu (University of Cagliari, Italy )
• Abstract: vide link

• October 04 USP-UNICAMP Geometry Seminar (at UNICAMP) 
• Prof. Stefano Nardulli (UFABC) 
• Dr. Icaro Gonçalves  (USP/ UFABC)

• October 05,  2018 at 14h
• Title:  Dualidade para (1,1)-tensores lineares em fibrados e uma aplicação para estruturas de Poisson-Nijenhuis.
• Speaker: Prof. Thiago Drummond (UFRJ) 
• Abstract: Para um fibrado E, é bastante conhecida a correspondência entre campos lineares em E (i.e. campos cujo fluxo é por automorfismos do fibrado) e em seu dual E*. Nessa palestra, apresentaremos uma nova dualidade para (1,1)-tensores lineares em E. Como exemplos de tensores satisfazendo essa relação de dualidade, tem-se: as estrutura complexas no espaço total de um fibrado holomorfo e em seu dual; os levantamentos tangente e cotangente de um endomorfismo da base. Como aplicação, vamos revisitar a teoria de estruturas de Poisson-Nijenhuis usando essa teoria de dualidade.

• September 28,  2018 at 14h
• Title:  Leaf topology of minimal foliations on 3-manifolds
• Speaker: Prof. Carlos Menino Coton
• Abstract: In this talk, we show examples of minimal hyperbolic foliations on closed 3-manifolds with a leaf homeomorphic to any closed surface puntured along a finite set (for instance a puntured torus). Moreover, we show examples of minimal foliations whose generic leaf is a hyperbolic plane but there is some leaf with infinite genus. Both examples are realized on Seifert manifolds and the transverse regularity of the foliation is just C^1. These exemples provide interesting corollaries and constitute a family of counterexamples to some conjectures in the area.
  This is joint work with Paulo Gusmão (UFF)
• venue:  243A

• September 14,  2018 at 14h
• Title:  Locally conformally symplectic convexity
• Speaker: Prof. Oliver Goertsches
• Abstract: After discussing the celebrated convexity theorem of Atiyah and
  Guillemin--Sternberg, stating that the image of the momentum map of an
  Hamiltonian torus action is a convex polytope, we explain a recent
  generalization to locally conformally symplectic geometry obtained in
  joint work with Florin Belgun and David Petrecca.

• August 17,  2018 at 14h
• Title:  Split Ricci-parallel connections on SL groups
• Speaker: Andrzej Derdzinski
• Abstract: The set E of Levi-Civita connections of left-invariant pseudo-Riemannian Einstein metrics on a given semisimple Lie group G always includes D, the Levi-Civita connection of the Killing form. When G is noncompact, a still-open 1975 conjecture of Dmitry Alekseevsky, if true, would imply that such left-invariant Einstein metrics on G are all indefinite. For the groups of the SL series, we explicitly describe several distinguished connected components of E. This extends an earlier result, joint with Swiatoslaw R. Gal, of the component of E which contains D. The emerging picture is consistent with Alekseevsky’s conjecture. The approach focuses on connections rather than metrics, which has the advantage of simultaneously generalizing and simplifying the algebraic aspect of the question.

• Modern Trends in Differential Geometry: preliminary talks
• July 19,  2018 at 14h
• Title: Cone structures and Finsler spacetimes
  
• Speaker: Prof. Miguel Angel Javaloyes
• Abstract: We will introduce the notions of cone structures and Finsler spacetimes,
  establishing an explicit relation between both concepts and providing a good amount of examples.
  Indeed, we will give a characterization of all the possible Lorentz-Finsler metrics under some regularity conditions.
  Finally, we will explore some basic properties of Finsler spacetimes, which include maximizing properties of geodesics and basic results on Causality.
• venue:  Auditório Gilioli

• Modern Trends in Differential Geometry: preliminary talks
• July 19,  2018 at 15h
• Title: Uma re-definiçao do conceito de buraco negro usando fronteiras causais.
  
• Speaker: Dr. Jonatan Herrera
• Abstract: A definiçao clasica de buraco negro [2,4] é apresentada em termos da denominada fronteira conforme. Para esta aproximaçao de buraco negro, define-se inicialmente o denominado "future null infinity" $\mathcal{J}^+$, um subconjunto da borda conforme que joga o role de "area de fuga" do buraco negro. Deste modo, um ponto está fora do buraco negro se pode ser conectado com $\mathcal{J}^+$ por meio de uma curva causal.A definiçao anterior apresenta porem um problema importante, a fronteira conforme nao pode ser obtida para todo modelo de espaço-tempo. Este é o caso, como foi observado por Marolf e Ross, das ondas planas [3]. Para evitar esse problema, nos apresentaremos uma nova definiçao de buraco negro com base na fronteira causal. Esta fronteira está definida para qualquer modelo de espaço tempo fortemente causal, incluindo modelos onde a fronteira conforme nao esta disponivel. Provaremos que a maioria das propriedades clasicas de buraco negro sao preservadas com esta definiçao, incluindo que as denominadas superficies atrapadas estao completamente cobertas por buracos negros se a condiçao de convergencia luminosa é satisfeita. Finalmente, mostraremos que as ondas planas generalizadas causalmente continuas nao admitem buracos negros.
  [1] José Luis Flores, Jónatan Herrera, and Miguel Sánchez, On the final definition of the causal boundary and its relation with the conformal boundary, Advances in Theoretical and Mathematical Physics 15 (2011), no. 4, 991–1057.
  [2] Stephen W. Hawking and George F. R. Ellis, The Large Scale Structure of Space-Time (Cambridge Monographs on Mathematical Physics), Cambridge University Press, 1975.
  [3] Donald Marolf and Simon F. Ross, Plane waves: To infinity and beyond!, Classical and Quantum Gravity 19 (2002), no. 24, 6289–6302.
  [4] R.M. Wald, General Relativity, University of Chicago Press, 1984.
• venue:  Auditório Gilioli

• Modern Trends in Differential Geometry: preliminary talks
• July 19,  2018 at 16:30h
• Title: Geometry of null hypersurfaces
  
• Speaker: Oscar Alfredo Palmas Velasco 
• Abstract: In this talk I will review the techniques for studying null hypersurfaces in Lorentzian manifolds and give the characterization of them when adding the condition of being totally umbilical or isoparametric.
• venue:  Auditório Gilioli

• Modern Trends in Differential Geometry: preliminary talks
• July 19,  2018 at 17:30h
• Title: On isoparametric surfaces in homogeneous 3-spaces
  
• Speaker: Prof. Miguel Vazquez
• Abstract: A hypersurface of a Riemannian manifold is called isoparametric if it and its nearby equidistant hypersurfaces have constant mean curvature. In spaces of constant curvature, Cartan proved that a hypersurface is isoparametric
  if and only if has constant principal curvatures. However, this characterization does not necessarily hold in spaces of nonconstant curvature. In this talk I will present a recent joint work with José Miguel Manzano (ICMAT-CSIC, Madrid)
  where we initiated the study of isoparametric surfaces and surfaces with constant principal curvatures in homogenous 3-spaces, obtaining their classification in the homogeneous 3-spaces with 4-dimensional isometry group.
• venue:  Auditório Gilioli

• Modern Trends in Differential Geometry: preliminary talks
• July 20,  2018 at 14h
• Title: Diameter of quotients of the sphere by isometric group actions.
  
• Speaker: Dr. Ricardo Mendes
• Abstract: (Joint with C. Gorodski, C. Lange, A. Lytchak) We show the existence of C>0 such that, for all n>1 and every closed non-transitive subgroup G of O(n+1), the diameter of the quotient of the unit sphere S^n by G is larger than C. The novelty is that C is independent of the dimension n. The classification of finite simple
  groups is used in the proof.
• venue:  Auditório Gilioli

• Modern Trends in Differential Geometry: preliminary talks
• July 20,  2018 at 15.00h
• Title: Remarks on the abelian convexity theorem
  
• Speaker: Prof. Leonardo Biliotti 
• Abstract: in this seminar we discuss abelian convexity theorem. Convexity along an orbit is established in a very general setting using Kempf-Ness functions. This is applied to give short proofs of the Atiyah-Guillemin-Sternberg theorem and of abelian convexity for the gradient map in the case of a real analytic submanifold of complex projective space. Finally we give an application to the action on the probability measures. This is a joint work with Alessandro Ghigi that
  has been accepted for pubblication on PAMS.
• venue:  Auditório Gilioli

• Modern Trends in Differential Geometry: preliminary talks
• July 20,  2018 at 16:30h
• Title: Extending a diffeomorphism finiteness theorem to dimension 4.
  
• Speaker: Prof. Curtis Pro (California State University, Stanislaus)
• Abstract: In the early 90s, Grove, Petersen, and Wu, and independently Perelman, showed in dimensions different than 4,
  the conclusion of Cheeger's Finiteness Theorem still holds without the assumption of an upper curvature bound.
  Namely, given numbers $k\in\mathbb R, v, D>0$, if $n\neq 4$, there are at most finitely many differentiable structures on the class of $n$-manifolds $M$ that support metrics with $\sec M\geq k, \mathrm{vol}\,M\geq v,$ and $\mathrm{diam}\,M\leq D.$
  In this talk, I'll present current joint work with Fred Wilhelm that shows, with a new approach, the same is also true in dimension 4.
  
• venue:  Auditório Gilioli

• Modern Trends in Differential Geometry: preliminary talks
• July 20,  2018 at 17:30h
• Title:  A Weitzenboeck viewpoint on sectional curvature and applications
  
• Speaker: Prof. Renato G. Bettiol
• Abstract:  In this talk, I will describe a new algebraic characterization of
  sectional curvature bounds that only involves curvature terms in the
  Weitzenb\"ock formulae for symmetric tensors. This characterization is
  further clarified by means of a symmetric analogue of the
  Kulkarni-Nomizu product, which renders it computationally amenable.
  Furthermore, a related application of the Bochner technique to closed
  4-manifolds with indefinite intersection form and positive or
  nonnegative sectional curvature will be discussed, yielding some new
  insight about the Hopf Conjecture. This is based on joint work with R.
  Mendes (Univ. zu Koeln, Germany)
• venue:  Auditório Gilioli

• ICM 2018 Satellite Conference (IME-USP):
  Modern Trends in Geometry
  July 23-27, 2018

• USP-UNICAMP Geometry Seminar 
• June 8, 2018 at 14h
• Title: A Holder continuidade Local do perfil isoperimétrico numa Variedade Riemanniana completa não compacta
  com geometria limitada.
  
• Speaker: Prof. Abraham Munoz Flores-UERJ 
• Abstract:  vide pdf

• USP-UNICAMP Geometry Seminar
• June 8, 2018 at 15h-15:30h
• Title: An analysis of the reduced thin-sandwich equations
  
• Speaker: Dr. Rodrigo Avalos (UFC)
• Abstract: vide pdf

• USP-UNICAMP Geometry Seminar 
• June 8, 2018 at 16h
• Title: A toy model for homogeneous contact geometry
  
• Speaker: Eder de Moraes Correa - IMPA
• Abstract: vide pdf

• May25, 2018 at 14h
• Title: Variedades riemannianas planas e reduzibilidade
  
• Speaker: Prof. Andrzej Derdzinski
• Abstract: Em um artigo publicado no Journal of Pure and Applied Algebra (1991)Hiss e Szczepanski provaram um teorema que estabelece a reduzibilidade da representação de holonomia para toda variedade riemanniana compacta plana de dimensão maior que um, com a conclusão adicional que o subespaço invariante não nulo e próprio do espaço tangente pode ser escolhido de tal modo que ele seja gerado por um subconjunto do reticulado associado à variedade dada.O que nos interessa aqui são algumas consequências geométricas do resultado mencionado acima e as suas ramificações no contexto dum outro teorema,  obtido pelos mesmos autores em um artigo de 1997, segundo o qual em certas
  dimensões maiores que 20 existem variedades riemannianas compactas planas cujo primeiro numero de Betti é igual a zero.

• May 25, 2018 at 15h
• Title: Geometric Stacks and Groupoids
  
• Speaker: Joel Villatoro
• Abstract: This talk will survey some folklore theorems about the interaction between the theory of Lie groupoids
  and geometric stacks on the site of smooth manifolds. To do this, a more general theorem
  about the relationship between geometric stacks on a site and internal groupoids will be discussed.
  I will show how considering alternative sites can be applied to studying Morita equivalences of Lie groupoids equipped with additional geometry.

• May  8,  to May 10 2018, , at 14:30
• Title: An introduction to Flat Manifolds (mini-curso)
• Speaker: Prof.  Prof. Andrzej Szczepanski (Gdansk, Polônia) 
• Abstract: 
• Lecture 1: Definitions. Crystallographic groups. Bieberbach Theorems.
• Lecture 2: Classification:  Methods by H. Zassenhaus, E. Calabi and A. T. Vazquez
• Lecture 3: Symmetries of Flat Manifolds and Crystallographic Groups. Examples and open problems.
• Reference: L. S. Charlap - Bieberbach Groups and Flat Manifolds, Springer 1986
  A. Szczepanski - Geometry of Crystallographic Groups, World Scientific 2012
  J. Wolf - Spaces of constant curvature, McGraw - Hill, 1967

• USP-UNICAMP Geometry Seminar
• May 4, 2018  at  Unicamp
• 13:00 - 13:15 - Leonardo Cavenaghi (USP)
  
• 13:15 - 14:00 - Daniel Fadel (IMECC)
• 14:00 - 15:00 - Carlos Grossi (ICMC-USP SCar)
• 15:00 - 15:15 - Intervalo
• 15:15 - 16:15 - Paolo Piccione (IME-USP)
• Abstracts: see http://www.ime.unicamp.br/~geodif/
  
  

• April 20, 2018 at 14h
• Title: Holonomic submanifolds
• Speaker: Marcos Dajczer (IMPA)
• Abstract:An isometric immersion of a Riemannian manifold into a space form is said to be holonomic if the manifold carries
  a global system of orthogonal coordinates such that at any point the coordinate vector fields diagonalize the second fundamental form.  In this talk I will discuss several results, ranging from classical to recent, about these submanifolds.

• April 25, 2018 at 15h
• Title: A classification of semistable Higgs bundles on Calabi-Yau manifolds
  
• Speaker: Valeriano Lanza
• Abstract: In a recent work by Biswas, Bruzzo, Graña Otero and Lo Giudice it is shown that on a simply connected Calabi-Yau manifold there is no polystable Higgs bundle with nontrivial Higgs field. The same is not true for semistable Higgs bundles, as examples can be easily provided. Nevertheless, Higgs fields for semistable Higgs bundles on Calabi-Yau
  manifolds are strongly constrained. The goal of this talk is to discuss the situation for bundles of low rank,
  for which we are able to provide a complete classification of possible Higgs fields. Furthermore, we provide also an application to a conjecture about a particular class of semistable Higgs bundles (the so-called curve
  semistable ones), which is proved for K3 and related surfaces.

• Second Joint Meeting of Mathematicians Ohio State University - University of São Paulo
  Mar 12-16, 2018
  https://www.ime.usp.br/~osuusp/

• March 7, 2018 at 14h
• Title: Robust index bounds for minimal hypersurfaces in compact symmetric spaces and isoparametric submanifolds
• Speaker: Dr Ricardo Mendes (Universitaet zu  Koeln)
• Abstract: (joint work with C. Gorodski and M. Radeschi)
  It has been conjectured by Marques-Neves-Schoen that, for every compact Riemannian manifold (M,g) with positive Ricci curvature, there exists a positive constant C such that every closed minimal hypersurface of M has Morse index bounded below by C times its first Betti number. This conjecture has been verified for the spheres by Savo, for every compact rank
  one symmetric space by Ambrozio-Carlotto-Sharp, and for every compact symmetric space (with the index replaced with index plus nullity) by Mendes-Radeschi. In the present work we expand this list of examples to infinitely many isoparametric hypersurfaces of spheres and their focal manifolds. We also show that, for all our new examples, as well as many of the
  previously known examples (including the spheres), such an index bound remains valid after any small deformation of the ambient metric g.

• February, 22, 2018 at 15h
• Title: Transnormal functions in Finsler spaces and some application in Physics.
• Speaker:  Hengameh Raeisi (ime-usp)
• Abstract:  In this talk, we  state some results on transnormal functions on Finsler spaces
  and singular foliation of codimension 1. Then some applications of transnormal functions in Physics
  are provided, such as  propagation of the wildfire.

• Dezember  8, 2017, 2017 14:00h  
  
• Title: Killing foliations via deformations
• Speaker: Francisco Carlos Caramello Junior (UFScar

• Joint  with Workshop on Geometry in Algebra and Algebra in Geometry - GAAG III  
• Dezember  1, 2017, 2017 14:00h  
  
• Title: Symplectic structures up to homotopy
• Speaker: Prof. Cristián Ortiz (IME-USP)

• November 24, 2017 14:00h  
  
• Title: Curvatura harmônica – nenhum caso genérico
• Speaker: Prof. Andrzej Derdzinski (Ohio)

• November 24, 2017 16:30h
• Title: Folheações ortogonais em variedades riemannianas
• Speaker: Euripedes carvalho (Ime-USP/ IFCE-Ceará) 

• November 24, 2017 15:00h
• Title: Principais Resultados sobre a Conjectura de Chern
• Speaker: Prof. Luiz Amancio Jr. (Uni-Rio)
• Abstract: vide Link  

• November 10, 2017 14:00h
• Seminário conjunto com: Seminários de Teoria da Computação, Combinatória e Otimização                     
  
• Title: Discrete geometry of surfaces towards the filling area conjecture
• Speaker: Dr. Marcos Cossarini (IMPA)

• November 10, 2017 15:15h
• Title: Navegando em um espaço folheado
• Speaker: Benigno Alves (IME-USP) 

• USP-Unicamp Seminar (at IME-USP)
• November 10, 2017 15:30h
• Title: Imersões e Spinors
• Speaker: Prof.  Rafael Leão  (Unicamp)

• October 20 2017 , 2017 14h
• Title:  Real geometric quantisation of K3 surfaces
• Speaker: Dr. Romero Solha  (Puc-rio)

• USP-Unicamp Geometry seminar
• October 6 2017, 2017 14h
• Title:  The Geometry of Orbit Spaces:Quaternionic-torus reductions.
• Speaker: Dr. Francisco J. Gozzi (USP/UFABC)
• Place: Imecc-Unicamp

• USP-Unicamp Geometry seminar
• October 6 2017, 2017 15h
• Title:  Construction of G2G2-instantons via twisted connected sums
• Speaker: Prof. Henrique Sá Earp (UNICAMP)
• Place: Imecc-Unicamp

• September 29, 2017 14h
• Title:  Aplicações de Deformações de Cheeger em curvatura positiva
• Speaker: Leonardo Francisco Cavenaghi (Unicamp)

• September 29, 2017 15h
• Title:  On some equivariantly related G-manifolds (continuation of Leonardo's talk)
• Speaker:Prof. Llohann Dallagnol Sperança

• September 22, 2017 14h
• Title: The Geometry of Orbit Spaces:Quaternionic-torus reductions
• Speaker: Dr. Francisco J. Gozzi (usp/ ufabc)

• September 15, 2017, 14h
• Title:  Complete minimal submanifolds with nullity in space forms.
• Speaker: Prof. Marcos Dajczer -impa 

• September 15, 2017 15h
• Title: Minimal hypersurfaces in compact symmetric spaces
• Speaker: Dr. Ricardo Mendes- Uni zu Koeln

• August 11, 2017, at 11:00h
• Title: Riemannian Yang-Mills connections with quadratic constraints
• Speaker: Prof. Andrzej Derdzinski, The Ohio State University

• July 07, 2017, at 14:00h
• Title: On the moduli space of isometric surfaces with the same mean curvature in 4-dimensional space forms
• Speaker: Prof. Theodoros Vlachos (at ime-usp)

• June 23, 2017, at 14:00h
• Title: Configuraçoes de Bandeiras
• Speaker: Prof. Elisha Falbel (Université Paris 6 )

• June 9, 2017: at 14:00h  
• Title: Gelfand pairs, Symmetric Spaces and Symplectic Realizations
  
• Speaker:  Prof.  Rui Loja Fernandes (University of Illinois)

• June 2, 2017: at 14:00h  
• Title: A new class of minimal submanifolds    
  
• Speaker:  Prof.  Marcos Dajczer (IMPA)

• May 26, 2017 2017: at 14:00h  
• Title: Curvatura extrínseca de órbitas de representações   
  
• Speaker: Artur Bicalho (IME-USP)

• May 12, 2017: at 14h  
• Title: Holomorphic curves and symplectic embedding problems   
  
• Speaker:  Dr Keon Choi (IME-USP)

• May 9, 2017: at 14:30h  
• Title: Harmonic curvature in dimension four   
  
• Speaker:  Prof.  Andrzej Derdzinski

• USP-Unicamp Geometry seminar
• May 5, 2017: at 15h  
• Title: Rigidity and Vanishing of Basic Dolbeault Cohomology of Sasakian Manifolds       
  
• Speaker: Prof. Dirk Toeben (Ufscar)
• Place  Imecc-Unicamp

• USP-Unicamp Geometry seminar
• May 5, 2017: at 14h  
• Title: Closure of singular foliations: the proof of Molino's conjecture         
  
• Speaker: Prof. Marcos M. Alexandrino (IME-USP)
• Place: - Imecc-Unicamp

• April 28, 2017: at 14h  
• Title: On the geometry of submanifolds of the conformal sphere         
  
• Speaker: Prof. Marco Magliaro (UFC)

• April 28, 2017: at 15h  
• Title: T-duality on nilmanifolds       
  
• Speaker: Dr. Viviana del Barco (Unicamp) 

• USP-Unicamp Geometry seminar
• April 07,  2017 at 14h
• Title:Entire unbounded constant mean curvature Killing graphs. 
• Speaker: Prof. Marcos Dajczer (IMPA)
• Place: at IME-USP

• USP-Unicamp Geometry seminar
• April 07, 2017: at 15h  
• Title: Gauge theory and G2-geometry on Calabi-Yau        
  
• Speaker: Dr.Lazaro Rodríguez  (IMECC)
• Place: at IME-USP
  

• March 31, 2017: at 16h  
• Title:String structures and Courant Reductions         
  
• Speaker: Dr Pedram Hekmati (IMPA)

• March 30, (thursday) 2017 at 14h
• Title: Totally geodesic Riemannian foliations on Lie groups 
• Speaker: Prof. Llohann Dallagnol Sperança (Unifesp)

• March 27, 29,31 2017
• Lectures: Subvariedades e ações isométricas em espaços simétricos de tipo não compacto
• Speaker:  Prof. Miguel Vazquez (Madrid Spain)

• March 21, 2017 (tuesday): at 14h  
• Title: Capacidades simplécticas dos espaços Hermitianos simétricos,         
  
• Speaker:  Prof. Roberto Mossa

• March  16, 2017 (thursday) at 14h
• title: Kähler manifolds with geodesic holomorphic gradients
• Speaker:  Andrzej Derdzinski (The Ohio State University)

• February 6, 2017 : at 14h  
• Title: The space of positive scalar curvature metrics
  
• Speaker:  Prof. Bernhard Hanke

• 2016-11-25: at 14h  
• Title: Homotopy Invariance in Lie Theory
  
• Speaker:  Dr. Pedro Frejlich

• 2016-11-11: at 14h  
• Title: Wind Finslerian structures: from Zermelo's navigation to the causality of spacetimes
  
• Speaker:  Prof.  Miguel Angel Javaloyes(Murcia-Spain)

• 2016-11-04: at 14h  
• Title: Closure of singular foliations: the proof of Molino's conjecture
  
• Speaker: Prof. Marcos. M. Alexandrino (IME-USP)

• 2016-10-21: at 14h  
• Title: Compatible triples on Lie algebroids with vector bundle metric
  
• Speaker: Prof. Nicolas Martinez

• 2016-10-07: at 14h  
• Title:  Teoria de Teichm\"uller e Colapso de Variedades Planas
  
• Speaker: Paolo Piccione

• 2016-08-26: at 14h  
• Title:  The Log-Convex Density Conjecture
  
• Speaker:   Prof. Frank Morgan (Williams College)

• 2016-08-26: at 15:20h  
• Title: Stability of measures on compact kahler manifold
  
• Speaker: Prof. Leonardo Billiot (Parma) 

• 2016-07-01: at 14h  
• Title:  Subvariedades Reais em Espaços Complexos
  
• Speaker:   Dr. Valentin Burcea

• 2016-06-24: at 14h  
• Title:  Gauge theory on contact 5-manifolds
  
• Speaker:  Dr Pedram Hekmati (impa)

• 2016-06-17: at 14h  
• Title:  Totally Geodesic Riemannian Foliations on Lie Groups
  
• Speaker:  Prof. Llohann Dallagnol Sperança (Centro Politécnico da UFPR)

• 2016-06-09 and 2016-06-10:   
• Event:  Workshop on the Geometry of Lie Pseudogroups (In honor of Prof. Antonio Kumpera)
  
• Organizers: Prof. Francisco Rui Tavares de Almeida, Prof.Odilon Otávio Luciano, Prof. Ivan Struchiner 

• 2016-05-20: at 14h  
• Title:  Superfícies umbílicas do produto de duas formas espaciais.
  
• Speaker: Prof. Jaime Leonardo Orjuela Chamorro (IM-UFBA)

• 2016-05-20: at 15h  
• Title:  The curvature of orbit spaces
  
• Speaker: Prof. Claudio Gorodski (IME-USP)

• 2016-05-13: at 14h  
• Title:  Ciclos folheados em variedades complexas
  
• Speaker:  Lucas Kaufmann  (Paris 06)

• 2016-05-06: at 14h  
• Title:  The Euler class of an umbilic foliation.
• Speaker:  Ícaro Gonçalves (IME-USP)

• 2016-04-29 at 14h  
• Title:  Hypersurfaces with constant mean curvature and three principal curvatures in S^{n+1}.
• Speaker: Prof. Sebastião Carneiro de Almeida (UFC)

• 2016-04-01 at 14h  
• Title:  Cuts, surgeries and toric contact structures
• Speaker: Prof Miguel Abreu (Instituto Superior Técnico, Lisboa)

• 2016-04-01 at 15h  
• Title:   Some applications of Lorentzian geometry to Teichmuller geometry
• Speaker:Prof. François Fillastre (France)

• 2015-11-19 at 15h  (thursday)
• Title:   Transverse measures and densities: from leaf spaces to differentiable stacks.
• Speaker: João Nuno Mestre

• 2015-11-06 at 14h 
• Title:   Gauge theory on stacks
• Speaker:  Prof. Ugo Bruzzo (Scuola Internazionale Superiore di Studi Avanzati -Trieste/ UFSC)

• 2015-10-23 at 14h 
• Title:    Folheações polares nos espaços projetivos quaterniónicos.
• Speaker:  Dr. Miguel Domínguez Vázquez (Impa)
  

• 2015-10-23 at 15h 
• Title:  Isoparametric hypersurfaces in complex hyperbolic spaces.
• Speaker:  Víctor Sanmartín López (Universidade de Santiago de Compostela)

• 2015-10-16 at 14h 
• Title:   The shape space defined by the Gromov-Wasserstein distance
• Speaker:  Prof. Facundo Memoli (Ohio State University)

• 2015-10-09 at 14h 
• Title:  Blow-ups of isometric actions and applications
• Speaker: Prof. Marcos Alexandrino (IME-USP)

• 2015-10-02 at 15:00h
• Title:  Campos de Darboux em subvariedades de codimensão 2 contidas em hipersuperfícies.
  
• Speaker: Prof. Marcos Craizer (PUC-Rio)

• 2015-10-02 at 14:00h.
• Title:  A Poincaré-Birkhoff theorem for Reeb flows on the tight $3$-sphere
  
• Speaker: Prof.  Pedro Salomão  (IME-USP)

• 2015-9-28 at 11h (monday-special section)
• Title:  Rank rigidity in dimension 3
• Speaker: Dr. Renato Bettiol (Upenn)

• 2015-9-25 at 14h
• Title:  On a Result of Berger.
• Speaker: Prof. Llohann Dallagnol Sperança (UFPR)

• 2015-9-18 at 14h
• Title:  Lie groupoids and vector fields on differentiable stacks
• Speaker: Prof. Cristián Ortiz (IME-USP)

• 2015-9-04 at 14h
• Title:  Smooth functions constant on the leaves of singular Riemannian foliations.
• Speaker: Dr.  Ricardo Mendes (WWU-Munster)

• 2015-8-28 at 14h
• Title:  Min-max, phase transitions and minimal hypersurfaces
• Speaker:   Marco Méndez (Impa)

• 2015-8-28 at 15h
• Title:  Cohomologia básica equivariante de uma folheação Riemanniana
• Speaker:  Prof Dirk Toeben (UFscar)

• 2015-8-28 at 16h
• Title:  IHyperbolic volumes of polyhedra with symmetries
• Speaker:   Prof. Nikolay Abrosimov (Sobolev Institut of Mathematics-Russia)

• 2015-8-21 at 14h
• Title:  Integração e fórmulas de localização em geometria simplética
• Speaker:  Carolina Torres Lozano (IME-USP)

• 2015-8-14 at 14h
• Title:  Rigidity of generalized graph manifold
• Speaker:  Prof. Wolfgang Ziller (Upenn) 

• 2015-8-07 at 14h
• Title:  Representations of 3-manifold fundamental groups into SL(n,C)
• Speaker:  Prof. Elisha Falbel (Université Paris 6)

• 2015-8-07 at 15h
• Title: Constant scalar curvature Kahler metrics on manifolds. 
• Speaker:  Prof. Bianca Santoro (CUNY)
  
  

• Date:  2015-8-07 at 16:30h.
• Title: Mass in Kahler geometry
• Speaker:  Prof. Hans Joachim Hein (University of Maryland)

• 2015-7-03 at 11h
• Title: Special Lagrangian Curvature
• Speaker:  Prof. Graham Smith (UFRJ)

• 2015-7-03 at 14h
• Title: Estendendo subvariedades nos espaços simétricos de tipo não compacto
• Speaker:  Dr. Miguel Dominguez Vázquez (IMPA)

• Date: 2015-06-19| 2015-06-26|  2015-7-03 at 15:15
• Title: (Workshop) Constructing Polar Actions
• Speaker:  Dr. Franscisco Gozzi (IME-USP)

• 2015-6-26 at 14h
• Title: Singular subalgebroids and their integration
• Speaker: Prof Marco Zambon (KU Leuven)

• Date:  2015-6-12 at 14h.
• Title:  The asymptotic Plateauís problem for minimal submanifolds and CMC hypersurfaces in a Hadamard manifold
• Speaker:  Prof. Jaime Ripoll - Universidade Federal do R. G. do Sul.

• 2015-5-13 and  2015-5-15:  Prof. Giuseppe Tinaglia (King's College)  (2  talks)

• 2015-5-4 to 2015-5-8:  First Joint Meeting of Mathematicians Ohio State University - Universidade de  São Paulo

• 2015-04-14 and 2015-04-16: Lectures of   Prof. Jurgen Berndt (King's College London, England)

• Date:  2015-03-27 at 14h.
• Title:  Convexity of the solutions to the constant mean curvature spacelike surface equation in $\mathbb{L}^3$
• Speaker: Dr. Alma Albujer (University of Córdoba-Spain)

• Date:  2015-03-27 at 15h.
• Title:  Dual characterizations of the $n$-dimensional sphere and hyperbolic space
• Speaker:  Dr. Magdalena Caballero (University of Córdoba- Spain)
  

• Date:  2015-03-20 at 14h.
• Title:  Homotopy type of spaces of curves with constrained curvature on flat surfaces.
• Speaker:  Dr. Pedro Zühlke (IME-USP)

• Date:  2015-03-13 at 14h.
• Title:  Existence and caracterization of isoperimetric regions in locally asymptotically Euclidean Riemanniana manifolds.
• Speaker:  Prof. Stefano Nardulli (UFRJ) 

• Congresso Brasileiro de Jovens Pesquisadores em Matemática Pura  Aplicada
  10 a 12 Dezembro 2014 - São Paulo - Brasil     

• Date: 2014-11-07  (friday) at 14h00
• Title: Categoría tangente de folheações e teoría de pontos críticos
• Speaker:  Dr. Carlos Menino (Puc-Rio)

• Date: 2014-10-17  (friday) at 14h00
• Title: Ehresmann Theorem for stacks
• Speaker:  Dr. Matias L. del Hoyo (IMPA)

• Date: 2014-10-10  (friday) at 14h00
• Title: Mean curvature flow of orbits of isometric actions
• Speaker:  Prof. Marcos M. Alexandrino  (IME-USP) 

• Date: 2014-09-26  (friday) at 14h00
• Title: Laçós nao triviais no grupo fundamental do grupo de difeomorfismos das orbitas coadjuntas.
• Speaker:  Prof. David Martínez Torres (PUC-rio) 
   
  

•  Date: 2014-09-26, 15h
• Title: G-Estruturas (parte II)
• Speaker: Prof. Ivan Struchiner (IME-USP)
• Location: Sala 266-A

• Date: 2014-09-19   (friday) at 14h00
• Title: Números Caraterísticos de Variedades e Folheações via Localização
• Speaker:  Prof. Dirk Toeben (UFSCar)
   
  

• Date: 2014-08-29 (friday) at 14h00
• Title: Zermelo navigation and flag curvature in pseudo-Finsler metrics
• Speaker:  Prof  Miguel Angel Javaloyes  (Murcia-Spain).

• Date:   2014-08-15 (friday) at 14h00
• Title: Ações Polares de Dimensão Baixa
•  Speaker: Francisco J. Gozzi (IMPA)

• Date:  14-08-08 at 14h00
• Title: Ações isométricas em esferas cujo espaço de órbitas é um orbifold Riemanniano
• Speaker: Prof: Claudio Gorodski (IME-USP)

• Date:  14-05-30 at 11h00
• Título : Folheações isoparamétricas não homogêneas e números primos.
• Speaker: Dr. Miguel Domínguez Vázquez (Impa).

• Date:  14-05-30, at 14h00
• Title: Título: Uma limitação para a norma do supremo de autofunções do Laplaciano em variedades riemannianas de volume infinito
• Speaker: Patricia Kruse Klaser (UFRGS)

• Date:  14-04-16 at 15h00
• Title: Surface Theory in the product of pseudo-Riemannian two-manifolds
• Speaker: Dr. Nikos Georgiou (UFSCar)

• Date: 4-04-14 , 14h
• Title: Entire bounded constant mean curvature Killing graphs
• Speaker: Prof. M. Dajczer (IMPA)
   
  

• Date 4-04-14   15hs: 
• Title: Exceptional minimal surfaces in spheres
• Speaker: Th. Vlachos (Ioannina, Grécia)

• Date: 28/ 03/ 14- 14h
• Title:  Yamabe-type equations with sign-changing nonlinearity on non-compact manifolds.
• Prof. Luciano Mari (UFC)
• Sala: B-09
   

• Date 28/03/13- 15h
• Title:O teorema de Gauss Bonnet no espaço de Heisenberg H^1 do ponto de vista subriemanniano
• Prof:Prof. José Veloso (UFPA)
  
• Sala B-09

• Date: 29/11/13- 14h
• Title: Isoperimetric regions in cylinder spaces
• Speaker: Prof. Jesus Gonzalo Perez (Univ. Autonoma de Madrid, Espanha)

• Date: 25/10/13- 14h
• Title: Hyperpolar actions on noncompact symmetric spaces
• Speaker: prof. Jürgen Berndt (King's College London)

• Date: 17/10/13- 14h
• Title: Complex hyperbolic bundles and the turnover
• Speaker: prof. Carlos Grossi ( ICMC)

• Date: 11/10/13- 14h
• Title:
• Speaker: Oscar Ocampo (IME - USP)

• Date: 11/10/13- 15h
• Title: Jacobi fields and conjugate points of quadratic Finsler metrics
• Speaker: Miguel Angel Javaloyes

• Date: 27/09/2013 , 15:00 h
• Titile: O teorema do tipo de órbita principal para grupóides de Lie
• João Nuno Mestre

• Date: 20/09/2013, 15:00h
• Title: O colchete de Frölicher-Nijenhuis em grupóides de Lie.
• Speaker: Prof. Thiago Drummond (UFRJ)

•  Date: 20/09/ 2013
• Títle: Esferas Afins Impróprias de Dimensão Par
• Speaker:  Prof. Marcos Craizer (PUC - Rio)
  
  

• Date: 20/09/2013, 14:00h
• Title: Esferas Afins Impróprias de Dimensão Pars
• Speaker: prof. Miguel Angel Javaloyes da Universidade de Murcia (Espanha)