Geometria_Pisa

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Seminario di geometria oggi
by Filippo Bianchi 11 May '23

11 May '23

Carə tuttə, Scusandomi per il poco preavviso, vi ricordo che oggi 11 Maggio in Aula Seminari avremo due seminari di geometria: alle 10 si terrà il seminario di Alejandro Gil-García (Universität Hamburg) dal titolo "A class of locally inhomogeneous complete quaternionic Kähler manifolds". Di seguito l'abstract. We prove that the one-loop deformation of any quaternionic Kähler manifold in the class of c-map spaces is locally inhomogeneous. As a corollary, we obtain that the full isometry group of the one-loop deformation of any homogeneous c-map space has precisely cohomogeneity one. This is a joint work with Vicente Cortés and Arpan Saha (https://arxiv.org/abs/2210.10097). Alle 11.30 si terrà il seminario di R. Inanç Baykur (University of Massachusetts Amherst) dal titolo "Exotic 4-manifolds with signature zero". Di seguito l'abstract. We are going to talk about our recent construction of small symplectic 4-manifolds with signature zero, which include the smallest closed simply-connected exotic 4-manifolds with signature zero known to date. Our novel examples are derived from explicit Lefschetz fibrations, with spin and non-spin monodromies. Joint work with N. Hamada. 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 18 Maggio in Aula Seminari alle 11: avremo Gabriele Viaggi (University of Heidelberg) che ci parlerà di "Divisible convex sets with properly embedded cones". Vi aspettiamo! Buona giornata, Alice, Filippo e Giuseppe

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Fwd: Talk on Thursday 11/05
by Filippo Bianchi 05 May '23

05 May '23

Segnalo un talk su gruppi di Coxeter e teoria dei modelli, giovedì prossimo. A presto, Filippo ________________________________ Da: Rosario Mennuni <R.Mennuni(a)posteo.net> Inviato: venerdì, maggio 5, 2023 4:58 PM A: Filippo Bianchi <filippo.bianchi(a)phd.unipi.it> Oggetto: Fwd: Talk on Thursday 11/05 Ciao Filippo, Giovedì prossimo nel seminario di logica ci sarà un talk sui gruppi di Coxeter. Potresti inoltrare l'annuncio ad eventuali interessati per favore? A presto, Rosario -------- Forwarded Message -------- Subject: Talk on Thursday 11/05 Date: Thu, 4 May 2023 13:21:04 +0200 From: Rosario Mennuni <rosario.mennuni(a)dm.unipi.it><mailto:rosario.mennuni@dm.unipi.it> To: slap(a)lists.dm.unipi.it<mailto:slap@lists.dm.unipi.it> Hi everyone, Our Logic Seminar will resume next Thursday, 11/05, with Gianluca Paolini (Università di Torino). More details at https://www.dm.unipi.it/eventi/the-isomorphism-problem-for-oligomorphic-gro… or below, as usual. The next and final talk of this semester will be given by Sonia L'Innocente on 01/06. Best wishes, Rosario ---------------------------------------------- Speaker: Gianluca Paolini Date and time: Thu 11/05, 14:30 Venue: Aula Seminari, Dipartimento di Matematica Title: First-order aspects of Coxeter groups Abstract: We will talk about recent advancement on the model theory of Coxeter groups. We will focus in particular on affine Coxeter groups and on Droms right-angled Coxeter groups. These investigations lead to a general model-theoretic analysis of homogeneity and existence of prime models in semidirect products of free abelian groups of finite rank by a finite group. This is joint with R. Sklinos.

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Seminario di geometria domani
by Filippo Bianchi 03 May '23

03 May '23

Carə tuttə, Vi ricordo che domani 4 Maggio alle 11 in Aula Seminari si terrà il seminario di Claudio Llosa Isenrich (Karlsruhe Institute of Technology) dal titolo "Finiteness properties, subgroups of hyperbolic groups and complex hyperbolic lattices". Di seguito l'abstract. Hyperbolic groups form an important class of finitely generated groups that has attracted much attention in Geometric Group Theory. We call a group of finiteness type $F_n$ if it has a classifying space with finitely man cells of dimension at most $n$, generalising finite presentability, which is equivalent to type $F_2$. Hyperbolic groups are of type $F_n$ for all $n$ and it is natural to ask if their subgroups inherit these strong finiteness properties. We use methods from complex geometry to show that every uniform arithmetic lattice with positive first Betti number in $PU(n,1)$ admits a finite index subgroup, which maps onto the integers with kernel of type $F_{n−1}$ and not $F_n$. This answers an old question of Brady and produces many finitely presented non-hyperbolic subgroups of hyperbolic groups. This is joint work with Pierre Py. Ricordiamo che le informazioni sui prossimi seminari si trovano sul sito<https://www.dm.unipi.it/categoria-evento/geometry-seminar/>. La settimana prossima avremo due seminari, entrambi Giovedì 11 Maggio in Aula Seminari: alle 10 avremo Alejandro Gil-García (Universität Hamburg) che ci parlerà di "A class of locally inhomogeneous complete quaternionic Kähler manifolds", mentre alle 11.30 avremo R. Inanç Baykur (University of Massachusetts Amherst) che ci parlerà di "Exotic 4-manifolds with signature zero". Vi aspettiamo! Buona giornata, Alice, Filippo e Giuseppe

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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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Geometria_Pisa