April 2026 - Geometria_Pisa - Mailing list — Dipartimento di Matematica, UniPI

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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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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Seminario Baby Geometri 23/04
by Giorgia BENASSI 20 Apr '26

20 Apr '26

Carə tuttə, vi invitiamo al seminario dei Baby Geometri di questa settimana: *Giovedì 23 Aprile 2026, alle ore 11:15* Presso la Saletta Riunioni (Dipartimento di matematica) *Susanna Terron* (University of Glasgow) terrà un seminario dal titolo: *Constructing Thompson representatives* di cui riportiamo l'abstract: In 2017 Vaughan Jones introduced a construction associating links to elements of Thompson’s group F. He then proved that all links can be obtained in such a way, opening the way to new possible connections between these objects. I will present Jones’ construction and extend it to obtain a surjective map into the set of pointed links. I’ll then define a new algebraic structure by endowing the group F3 with a monoid operation, which turns our map into a surjective monoid homomorphism. As a consequence, we obtain a standard form for connected sum representatives, which can then be extended to obtain representatives for a certain family of links, that we will refer to as tree links. 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 13/04
by Giorgia BENASSI 10 Apr '26

10 Apr '26

Carə tuttə, vi invitiamo al seminario dei Baby Geometri della prossima settimana: *Lunedì 13 Aprile 2026, alle ore 11:15* Presso l’*Aula Contini* (Palazzo della Carovana) *Shaked Bader* (University of Oxford) terrà un seminario dal titolo: *Group cohomology with Banach space coefficients* di cui riportiamo l'abstract: Gromov conjectured that the L^p-cohomology of simple Lie groups vanishes below the rank. Farb conjectured a fixed point property for actions of lattices in such groups on CAT(0) cell complexes of dimension lower than the rank. In this talk I will give a short introduction to group cohomology and prove that vanishing of \ell^1-cohomology up to degree n implies a finite orbit for every action on an n-dimensional contrcatible complex, thus in particular establishing that Gromov's conjecture implies Farb's conjecture. I will then give some insight to the proof of Gromov's conjecture. This talk is based on joint work with Saar Bader, Uri Bader and Roman Sauer. Vi ricordiamo infine che potrete trovare informazioni sui prossimi seminari sul nostro sito. Tutte le persone interessate sono invitate a partecipare. A presto, Lə organizzatorə

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Fwd: Seminario MAP
by Alessio DI PRISA 08 Apr '26

08 Apr '26

Inoltro questo annuncio per conto degli organizzatori dei seminari MAP. Saluti, Alessio ---------- Forwarded message --------- Da: Chiara GAMBICCHIA <chiara.gambicchia(a)sns.it> Date: mar 7 apr 2026, 16:10 Subject: Seminario MAP To: Alessio DI PRISA <alessio.diprisa(a)sns.it> Caro Alessio, ti sarei grata se potessi inoltrare l'annuncio del prossimo seminario MAP (di cui riporto sotto le informazioni) alla mailing list dei geometri, visto che lo speaker è Cristian Sopio, che so essere stato invitato in precedenza per un seminario di geometria. Grazie mille, Chiara ---------------------------------------------------- When and where: Thursday 9 April, at 11:30 in Aula Seminari (Dipartimento di Matematica). Speaker: Cristian Sopio (Università di Parma) Title: Weak elastic energy of rectifiable curves in the sphere Abstract: In 1950, Milnor introduced a definition of total curvature for rectifiable (hence Lipschitz) curves in R^n and proved that if the curve is C^2-regular and parametrized by arc length, this definition coincides with the integral of the norm of the geodesic curvature of the curve. In 2023, Mucci and Saracco proposed a definition of p-curvature for any exponent p greater than or equal to 1, showing that a rectifiable curve parametrized by arc length belongs to the Sobolev space W^{2,p} if and only if its p-curvature is finite. Moreover, in this case, the p-curvature equals the integral on the curve of the p-th power of the norm of its geodesic curvature. In this seminar, I will explain how the concept of p-curvature can be extended to rectifiable curves in the sphere and how analogous results can be obtained in this setting. This is joint work with D. Mucci and A. Saracco.

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seminario Alejandro Gil-Garcìa
by Diego Conti 07 Apr '26

07 Apr '26

Cari colleghi, vi segnalo che giovedì 23 aprile, alle 14:30 in aula seminari, Alejandro Gil-Garcìa terrà 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. 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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Annuncio Combinatorial Algebraic Topology and Applications IV
by Carlo Collari 07 Apr '26

07 Apr '26

Buongiorno, Ricordo a tutti gli interessati che dal 22 al 25 Giugno a Pisa si svolgerà CATA IV, di cui riporto l'annuncio. Le iscrizioni si chiuderanno il 30 Aprile. Saluti, Carlo Combinatorial Algebraic Topology, and Applications IV ----------------------------------------- https://gecogedi.dimai.unifi.it/event/1448/ Date: Monday, Jun 22, 2026 -- Thursday, Jun 25, 2026 Place: Pisa, Italy The workshop “Combinatorial algebraic topology and applications” is at its fourth edition. The first, second, and third editions were held in Pisa at the Centro di Ricerca Matematica “E. De Giorgi” on the 27-28 November 2023, 1-4 October 2024, and 16-19 September 2025, respectively. The main topics of the conference are combinatorics and algebraic topology (broadly intended), as well as their applications to different fields (e.g. data analysis, neural sciences and economics). The aim of the workshop is to gather researchers with common interest in the above topics and to create an atmosphere of discussion where to share ideas. For its fourth edition, the workshop will focus specifically on the following topics: applied (algebraic) topology, low-dimensional and geometric topology, and topological combinatorics. The workshop will consist of ten one-hour talks from invited speakers, along with contributed talks by selected participants. The talks will cover both theoretical and applied aspects of the subjects. The invited speakers are at different stages of the academic career, including professors, lecturers, PhD students and post-docs. Moreover, to stimulate discussion and exchange of ideas, the workshop will include free discussions, contributed talks, and possibly a problem session. We are committed to ensure gender balance as well as broad participation across academic backgrounds and career stages. Registration is free, though mandatory, due to limitations in the number of participants. Depending on funding limited support may be available for junior participants, with priority given to early registrations and contributed speakers. The *deadline for contributed talks and support is the 31st of March 2026*. The *deadline for registration is the 30th of April 2026*. LIST OF CONFIRMED SPEAKERS Valentina Bais (SISSA) Bruno Benedetti (University of Miami) Jelena Grbic (University of Southampton) Dmitrii Korshunov (Institut de mathématiques de Jussieu –Paris Rive Gauche) Jean- Baptiste Meilhan (Université Grenoble Alpes) Pegah Pournajafi (Collège de France) Francesca Pratali (Universiteit Utrecht) Anne-Laure Thiel (Université Bourgogne Europe) Francesco Vaccarino (Politecnico di Torino) So Yamagata (Fukuoka University) Organizing Commitee: L. Caputi, C. Collari, G. Menara Invited Speakers: webpage of the workshop: https://indico.sns.it/event/134/

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