- Geometria_Pisa - Mailing list — Dipartimento di Matematica, UniPI

Announcement: LiT IV Landing in Topology (Pisa, October 12-15)
by Leonardo Vannini 13 Jul '26

13 Jul '26

Dear all, We are pleased to announce the workshop: LiT IV - Landing in Topology, which will take place at Centro De Giorgi in Pisa (Italy), from October 12 to October 15, 2026. This is the conference website: https://indico.sns.it/event/142/overview This will be the fourth edition of a recurring event in low-dimensional topology and geometric group theory. Our aim is to gather young researchers and PhD students in the area, enabling them to discuss and exchange fruitful ideas in an inclusive and friendly atmosphere. The conference will feature nine research talks and two mini-courses. Junior participants are encouraged to expose their work in a flash talk session. Registration is open at the following link<https://indico.sns.it/event/142/registrations/85/>. The deadline for registration is August 25. Limited funds are available for the accommodation of registered participants. The deadline to apply for financial support is July 20. This is the list of the speakers: Minicourses Macarena Arenas (University of Cambridge) Giovanni Italiano (University of Oxford) Research talks Naomi Andrew (Laboratoire de Mathématiques d’Orsay) Luna Elliott (University of Manchester) Joseph MacManus (University of Bristol) Alexis Marchand (Instytut Matematyczny Polskiej Akademii Nauk) Jeronimo Garcia Mejia (University of Warwick) Alice Merz (HUN-REN Rényi Alfréd Matematikai Kutatóintézet) Monika (Uniwersytet Warszawski) Leone Slavich (Università di Genova) Gabriele Viaggi (Università di Pisa) Funded by - Università di Pisa - MUR via the project FIS3 "Topology and geometry of higher Teichmuller spaces" (FIS-2024-05142) - Foundation Compositio Mathematica Feel free to forward this announcement to anyone who might be interested. We look forward to seeing you in Pisa! Best wishes, Giorgia Benassi Elena Bogliolo Sabrina Botticchio Alberto Casali Ervin Hadžiosmanović Leonardo Vannini

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Seminario giovedi 18 giugno
by Andrea Tamburelli 16 Jun '26

16 Jun '26

Cari colleghi, vi segnalo che giovedi' 18 giugno alle 14:30 in aula seminari ci sara' un seminario di geometria. Trovate qui sotto titolo e abstract. Per chi fosse interessato, ci troviamo nell'atrio davanti all'aula Riunioni alle 13 per andare a pranzo con lo speaker. Saluti, Andrea __________________________________________________________________________ Titolo: Simplicial volume of real convex projective manifolds Speaker: Grazia Rago (Università di Bologna) Abstract: A real convex projective manifold is a (RP^d, PGL(d+1,R))-structure where the developing map's image is a properly convex domain Ω⊂RP^d and the holonomy group is a discrete, torsion-free subgroup Γ≤ PGL(d+1,R) preserving Ω. In this talk, we analyze the simplicial volume of a closed real convex projective manifold M≅Ω/Γ. We introduce the flat-rank of a properly convex domain and we show that if the flat-rank of Ω is 1, then ∥M∥>0. On the other hand, we present also examples where the flat-rank is greater than 1 and the simplicial volume is positive. To conclude, we relate the simplicial volume to the Euler characteristic, affirmatively answering a famous question by Gromov in this setting: if the simplicial volume of a closed aspherical manifold vanishes, must its Euler characteristic vanish as well?

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Baby geometri e origami 4/6
by Giorgia BENASSI 03 Jun '26

03 Jun '26

Carə tuttə, vi invitiamo all'ultimo seminario dei Baby Geometri di questo anno accademico: *Giovedì 4 *Giugno 2026, alle ore *18:00* Presso l'*Aula Magna* (Dipartimento di Matematica) *Andrea Gallese *(Scuola Normale Superiore) ci parlerà di origami e poligoni regolari. Abstract: It is well-known that a regular heptagon cannot be drawn using only a straightedge and compass. This is because the degree of any constructible number over $\mathbb{Q}$ must be a power of 2, while the seventh cyclotomic field has a degree of 6. With origami, however, it is possible to fold the regular heptagon. In this brief talk, we will explore how paper folding can be used to solve polynomials of degree 3 (and 5!), examining the theory of origami from both a theoretical and practical perspective. Vi ricordiamo infine che potrete trovare informazioni sui prossimi seminari sul nostro sito <https://sites.google.com/view/babygeometri/home>. Tutte le persone interessate sono invitate a partecipare. A presto, Lə organizzatorə

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Seminario Baby Geometri 28/05
by Giorgia BENASSI 25 May '26

25 May '26

Carə tuttə, Anche questa settimana vi invitiamo al seminario dei Baby Geometri: *Giovedì 28 *Maggio 2026, alle ore *11:15* Presso l'*Aula Seminari* (Dipartimento di Matematica) *Marco Vergamini* (Scuola Normale Superiore) terrà un seminario dal titolo: *Green currents of holomorphic correspondences* di cui riportiamo l'abstract: Green currents are central objects in holomorphic dynamics. They appear naturally as limit objects for the iteration of submanifolds, and they allow for a precise measure-theoretical study of the dynamics. In this talk I will survey their construction in various classical settings. I will then present recent results in the case of holomorphic correspondences. This talk is based on a joint work with Muhan Luo. Vi ricordiamo infine che potrete trovare informazioni sui prossimi seminari sul nostro sito <https://sites.google.com/view/babygeometri/home>. Tutte le persone interessate sono invitate a partecipare. A presto, Lə organizzatorə

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Seminario Baby Geometri 21/05
by Giorgia BENASSI 18 May '26

18 May '26

Carə tuttə, Anche questa settimana vi invitiamo al seminario dei Baby Geometri: *Giovedì 21 *Maggio 2026, alle ore 11:15 Presso l'*Aula Seminari* (Dipartimento di Matematica) *Filippo Baroni* (Trinity College Dublin) terrà un seminario dal titolo: *Algorithms for knots* di cui riportiamo l'abstract: In 1954, Alan Turing wrote "No systematic method is yet known by which one can tell whether two knots are the same", calling this a "problem which might well be unsolvable". Today, such systematic methods exist, and yet many questions remain unanswered about the apparently simple problem of distinguishing knots. In this talk, we will give an overview of both historical and recent results, demonstrating how telling knots apart is, to this day, still very hard. Vi ricordiamo infine che potrete trovare informazioni sui prossimi seminari sul nostro sito <https://sites.google.com/view/babygeometri/home>. Tutte le persone interessate sono invitate a partecipare. A presto, Lə organizzatorə

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Seminario Baby Geometri 14/05
by Giorgia BENASSI 12 May '26

12 May '26

Carə tuttə, Anche questa settimana vi invitiamo al seminario dei Baby Geometri: *Giovedì 14 Maggio* 2026, alle ore *11:15* Presso l'*Aula Fermi *(Palazzo della Carovana) *Ryan Lamy* (Université de Caen Normandie) terrà un seminario dal titolo: *Liftable Surface Braids* di cui riportiamo l'abstract: We begin with an introduction to surface braid groups and mapping class groups, as well as the Birman exact sequence, to link these two objects. Next, we explain the Birman-Hilden double cover of the punctured disc, and attempt to generalize it to other surfaces, which is relevant for surface braid groups. This will motivate the study of liftable surface braids, (braids that lift under this generalized double cover), and we will conclude with some recent results on these. Vi ricordiamo infine che potrete trovare informazioni sui prossimi seminari sul nostro sito <https://sites.google.com/view/babygeometri/home>. Tutte le persone interessate sono invitate a partecipare. A presto, Lə organizzatorə

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Seminario giovedi' 19 marzo
by Andrea Tamburelli 05 May '26

05 May '26

Cari colleghi, vi segnalo che giovedi' 19 marzo alle 14:30 in saletta riunioni ci sara' un seminario di geometria. Trovate qui sotto titolo e abstract. Per chi fosse interessato, ci troviamo nell'atrio davanti all'aula Riunioni alle 13 per andare a pranzo con lo speaker. Saluti, Andrea _______________________________________________________________________________________________ Titolo: Odd magical triples and maximal Higgs bundle Speaker: Enya Hsiao (Lipsia) Abstract: Higher Teichmüller theory is the study of connected components in the G^R-character variety consisting entirely of discrete and faithful surface group representations. Under the nonabelian Hodge correspondence, various problems in higher Teichmüller theory can be approached by using topological methods on the G^R-Higgs bundle moduli space. Following recent developments of Theta-positivity on the character variety side, it has been proposed by Bradlow, Collier, Garcia-Prada, Gothen and Oliveira that the corresponding components on the Higgs bundle moduli space are characterized by Slodowy slices of magical sl2-triples. In this talk, I will explain how the above framework can be extended to include the case of maximal components of a nontube type Hermitian Lie group by introducing the notion of odd magical triples, further supporting the expectation that all higher Teichmüller components arise via a Cayley correspondence.

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Seminario Baby Geometri 5/05
by Giorgia BENASSI 03 May '26

03 May '26

Carə tuttə, Anche questa settimana vi invitiamo al seminario dei Baby Geometri, che si terrà martedì anziché giovedì: *Martedì 5 Maggio* 2026, alle ore *11:30* Presso l'*Aula Seminari *(Dipartimento di Matematica) *Leonardo Vannini* (Università di Pisa) terrà un seminario dal titolo: *3-manifolds: detecting nonpositive curvature via topological decomposition* di cui riportiamo l'abstract: In the context of Thurston’s geometrization program, in 1995 Leeb addressed the question of whether a compact aspherical 3-manifold admits a nonpositively curved metric. In this talk, we will present his results, explaining how the problem can be approached using the decomposition of an irreducible 3-manifold into Seifert fibered and hyperbolic pieces. The problem then reduces to the following question: which flat metrics on the boundary tori of each piece extend to a nonpositively curved metric on its interior? Vi ricordiamo infine che potrete trovare informazioni sui prossimi seminari sul nostro sito <https://sites.google.com/view/babygeometri/home>. Tutte le persone interessate sono invitate a partecipare. A presto, Lə organizzatorə

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Fwd: Workshop announcement
by Alessio DI PRISA 24 Apr '26

24 Apr '26

Carə tuttə, Inoltro l'annuncio per il workshop "Young Women in Geometric Topology" che si terrà a Bonn dal 13 al 15 di questo Luglio. Un saluto, Alessio Di Prisa ---------- Forwarded message --------- Da: Valentina Bais <vbais(a)sissa.it> Date: gio 23 apr 2026, 14:42 Subject: Workshop announcement To: Mailing list seminari Math Trieste <math-users(a)lists.sissa.it> Dear all, This is an announcement for the workshop "*Young Women in Geometric Topology*", to be held in Bonn (Germany) *from July 13**th** to July 15**th* * 2026.* This three-day workshop will highlight the work of women and gender-expansive people in geometric topology, especially early career researchers. There will be two mini courses of two lectures each, two special talks, several short invited talks, as well as contributed lightning talks. Also planned are talks, panels, and group discussions on academic careers and challenges faced by women and gender-expansive people in academia. *Invited speakers and panelists:* Maria Rita Casali (University of Modena and Reggio Emilia) Alexandra Kjuchukova (University of Notre Dame) Marissa Loving (University of Wisconsin-Madison) Laura Marino (University of Hamburg) Porter Morgan (University of Massachusetts Amherst) Sophia Piacenza (University of Bonn) Marithania Silvero (University of Seville) Susanna Terron (University of Glasgow) Paula Truöl (University of Glasgow) Monika (University of Warsaw) *Organizers*: Valentina Bais (SISSA) Arunima Ray (University of Melbourne) Magdalina von Wunsch-Rolshoven (University of Bonn ) You can find the official website here. https://math-events.uni-bonn.de/event/917/ All the best, Valentina Bais (on behalf of the organisers)

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seminario domani
by Diego Conti 22 Apr '26

22 Apr '26

Cari geometri, vi ricordo il seminario di domani 23 aprile, alle 14:30 in aula seminari, di Alejandro Gil-Garcìa. Trovate qui sotto titolo e abstract. Per chi fosse interessato, ci troviamo nell'atrio davanti all'aula riunioni alle 13 per andare a pranzo con lo speaker. Title: The algebraic square of an irreducible complex spinor Abstract: We characterize, in every dimension and signature, the algebraic squares of an irreducible complex spinor as a pair of exterior forms satisfying a prescribed system of algebraic relations that we present in terms of the geometric product of the underlying quadratic vector space. As a result, we obtain a general correspondence between irreducible complex spinors and algebraically constrained exterior forms, which clarifies the subtle relationship between spinors and exterior forms and contributes towards the understanding of spinors as the square root of geometry. Time permitting, we will explore the differential counterpart of this correspondence. This is joint work with Carlos Shahbazi. The talk is based on https://arxiv.org/abs/2510.13801. Saluti Diego

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