April 2023 - Geometria_Pisa - Mailing list — Dipartimento di Matematica, UniPI

Seminario di geometria domani
by Filippo Bianchi 26 Apr '23

26 Apr '23

Carə tuttə, Vi ricordo che domani 27 Aprile alle 11 in Aula Seminari si terrà il seminario di Federica Bertolotti (SNS Pisa) dal titolo "Integral Simplicial Volume and Delta Complexity: find the differences". Di seguito l'abstract. Integral Simplicial Volume and Delta Complexity are invariants that try to capture the complexity of manifolds in terms of simplices from two different points of view. The exact value of these two invariants is known in dimensions 1 and 2, where they always coincide. It is then a natural question whether these two invariants are still close to each other in higher dimensions. During this talk, we will see possible approaches to address this problem, even with the awareness that computations become very hard already in dimension 3. Ricordiamo che le informazioni sui prossimi seminari si trovano sul sito<https://www.dm.unipi.it/categoria-evento/geometry-seminar/>. Il seminario successivo sarà Giovedì 4 Maggio alle 11 in Aula Seminari: avremo Claudio Llosa Isenrich (Karlsruhe Institute of Technology) che ci parlerà di "Finiteness properties, subgroups of hyperbolic groups and complex hyperbolic lattices". Vi aspettiamo! Buona giornata, Alice, Filippo e Giuseppe

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Seminario di geometria 20/04
by Filippo Bianchi 20 Apr '23

20 Apr '23

Carə tuttə, Vi ricordo che oggi alle 11 in Aula Seminari si terrà il seminario di Léo Bénard (Georg-August Universität Göttingen) dal titolo "Torsion function on character variety, divisor and multiplicity". Di seguito l'abstract. Reidemeister torsion is a combinatorial invariant, famous among other things for distinguishing finite quotients of the sphere S^3, the lenticular spaces, which have the same homotopy type but which are not homeomorphic. The study of the torsion for more general 3-manifold (such as knot exteriors) is closely related to the study of their character varieties: these are algebraic varieties whose points are conjugacy classes of representations of fundamental groups. I will review some results I obtained in my thesis on this subject, and will discuss a recent result in collaboration with Ryoto Tange, Anh Tran and Jun Ueki, where we study the divisor induced by the torsion on these varieties. Ricordiamo che le informazioni sui prossimi seminari si trovano sul sito<https://www.dm.unipi.it/categoria-evento/geometry-seminar/>. Vi aspettiamo! Buona giornata, Alice, Filippo e Giuseppe

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postdoc position in Bologna (deadline May 8)
by Martino Lupini 17 Apr '23

17 Apr '23

Hi, all, A 3-year postdoc position at the University in Bologna on connections between topology and logic has been announced https://bandi.unibo.it/ricerca/assegni-ricerca?id_bando=66281 The application deadline is May 8 Please feel free to forward to anyone who might be interested. I am happy to answer any question that any potential applicant might have. Best, Martino

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Seminari di Geometria 13/4
by Filippo Bianchi 13 Apr '23

13 Apr '23

Care tutte e cari tutti, Vi ricordo che domani alle 11 in Aula Seminari si terrà il seminario di Raphael Zentner (Durham University) dal titolo "SL(2,C)-character varieties of knots and maps of degree 1 – Raphael Zentner (Durham University)", di cui riporto l'abstract We ask to what extend the SL(2,C)-character variety of the fundamental group of the complement of a knot in S^3 determines the knot. Our methods use results from group theory, classical 3-manifold topology, but also geometric input in two ways: the geometrisation theorem for 3-manifolds, and instanton gauge theory. In particular this is connected to SU(2)-character varieties of two-component links, a topic where much less is known than in the case of knots. This is joint work with Michel Boileau, Teruaki Kitano, and Steven Sivek. Vi aspettiamo! Buona serata, Alice, Filippo e Giuseppe

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Seminario di geometria oggi
by Filippo Bianchi 06 Apr '23

06 Apr '23

Buonasera, Scusandoci per il poco preavviso, annunciamo il seminario di geometria di oggi. Ricordiamo che l'elenco completo dei seminari si trova a questa pagina<https://www.dm.unipi.it/categoria-evento/geometry-seminar/>. A presto, Filippo, Alice e Giuseppe ----- 06-Apr-2023 - 11:00 Sala Seminari (Dip. Matematica) Instanton Floer homology of almost-rational plumbings Antonio Alfieri UQAM Plumbed three-manifolds are those three-manifolds that can be be realized as links of isolated complex surface singularities. Inspired by Heegaard Floer theory Nemethi introduced a combinatorial invariant of complex surface singularities (lattice cohomology) that was recently proved to be is isomorphic to Heegaard Floer homology. I will give an introduction to lattice cohomology, and expose some work in collaboration with John Baldwin, Irving Dai, and Steven Sivek showing that the lattice cohomology of an almost-rational singularity is isomorphic to the framed Instanton Floer homology of its link.

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Fwd: Conference "Geometric Topology, Art, and Science" in Modena and Reggio Emilia (June 8-10, 2023)
by Bruno Martelli 06 Apr '23

06 Apr '23

---------- Forwarded message --------- Da: Maria Rita CASALI <mariarita.casali(a)unimore.it> Date: Mer 5 Apr 2023, 19:08 Subject: Conference "Geometric Topology, Art, and Science" in Modena and Reggio Emilia (June 8-10, 2023) To: Maria Rita CASALI <casali(a)unimore.it> Dear Colleagues, we are pleased to announce the conference *Geometric Topology, Art, and Science* to be held in Reggio Emilia (Italy) on June 9-10, 2023, with a pre-meeting in Modena on June 8, 2023. The conference is jointly organised by the Department of Physics, Informatics and Mathematics (FIM) and the Department of Sciences and Methods for Engineering (DISMI) of the University of Modena and Reggio Emilia, on the occasion of 70th birthday of Luigi Grasselli, full professor of Geometry at DISMI. The conference focuses on recent advances in Geometric Topology, with a particular attention to combinatorial descriptions of 3- and 4-manifolds (branched coverings, knots and braids, trisections, colored graphs, etc…), as well as to the interactions with other disciplines, ranging from physics (with the theory of *random tensors*) to geometrical aspects in classical and contemporary art. Confirmed speakers include • Bruno Benedetti (University of Miami) • Alessia Cattabriga (University of Bologna) • Antonio Costa (UNED, Madrid) • Massimo Ferri (University of Bologna) • Luca Lionni (University of Heidelberg) • Josè Maria Montesinos Amilibia (Real Academia de Ciencias Exactas, Físicas y Naturales de España) • Daniele Zuddas (University of Trieste) The conference will also host a poster session. During the preliminary event (which will take place in Modena on June 8 afternoon, at the Department FIM) young researchers who intend to present a poster will be invited to give short talks on their own research. In this occasion, we foresee ample room for discussion and informal interaction in order to facilitate the scientific exchange between participants. More information and the detailed programme can be found at the webpage https://sites.google.com/view/gras70/ Participants are requested to register at https://sites.google.com/view/gras70/registration and fill the related form. No registration fee is required. The deadline for talk/poster submission and registration is April 30, 2023. A limited amount of funding is available for early-career researchers intending to participate in the session of talks and to present posters. Application for funding can be made through the registration form. Finally, we would like to ask you to forward the announcement to any of your colleagues who might be interested. We look forward to meeting you at the conference. *Maria Rita Casali* *(on behalf of the Organisers)*

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Fwd: Conference: Probability and Geometry in, on and of non-Euclidian spaces at CIRM
by Bruno Martelli 04 Apr '23

04 Apr '23

---------- Forwarded message --------- From: Bram Petri <brampetri(a)gmail.com> Date: Mon, Apr 3, 2023 at 3:21 PM Subject: Conference: Probability and Geometry in, on and of non-Euclidian spaces at CIRM To: Bram Petri <brampetri(a)gmail.com> Dear all, I'm writing to advertise a conference at CIRM that we're organizing with Nicolas Curien, Elba Garcia-Failde and Arvind SIngh. It's called " *Probability** and Geometry in, on and of non-Euclidian spaces*". For more information, see here: https://conferences.cirm-math.fr/2897.html <https://es.sonicurlprotection-fra.com/click?PV=2&MSGID=20230403132100014094…> We have some funding available for accommodation, but most probably not for travel. If you know anyone who might be interested, please don't hesitate to spread the word! Best wishes, Bram

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I: Postdoc position in Symplectic Topology at IMPA
by Paolo Lisca 04 Apr '23

04 Apr '23

Inoltro annuncio di posizione post-doc in topologia simplettica. Buona giornata, Paolo Lisca -------------------- Da: Vinicius G. B. Ramos <vgbramos(a)impa.br> Oggetto: Postdoc position in Symplectic Topology at IMPA Dear colleagues, We invite applications for a postdoctoral position in symplectic topology at IMPA in Rio de Janeiro. The starting date is between 1 October 2023 and 31 March 2024. The duration is one year with a possible extension to a second year. Candidates should email Vinicius Ramos (vgbramos(a)impa.br<mailto:vgbramos@impa.br>) as soon as possible including the following documents: 1) CV including a list of publications 2) Research statement 3) List of references Best regards, Vinicius Ramos

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