December 2021 - Geometria_Pisa - Mailing list — Dipartimento di Matematica, UniPI

Seminario 27/10/2021
by Tamas Szamuely 25 Nov '22

25 Nov '22

Cari tutti, ecco il programma del prossimo seminario di geometria algebrica e aritmetica di Pisa: Mercoledì 27 ottobre 2021, Dipartimento di matematica, Aula Magna 15:00--16:00 Valerio Melani (Pisa): The Poisson structure on the affine Grassmannian via derived algebraic geometry Motivated by a conjecture of Kapranov-Ginzburg-Vasserot, we will explain how to reinterpret the classical Poisson structure on the affine Grassmannian using tools from derived symplectic (and Poisson) geometry. Our approach is based on the study of symplectic structures on derived stacks whose cotangent complex is not perfect, and therefore uses in a crucial way the formalism of Tate modules. The talk is based on joint work with Mauro Porta and Pavel Safronov. Homepage del seminario: http://pagine.dm.unipi.it/tamas/saga.html Migliori saluti, Tamás Szamuely

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I: Position at the Erdõs Center (Budapest)
by Paolo Lisca 21 Dec '21

21 Dec '21

Inoltro annuncio di semestre speciale a Budapest, con varie posizioni associate. Paolo Lisca ________________________________ Da: Stipsicz Andras <stipsicz.andras(a)renyi.hu> Inviato: lunedì 20 dicembre 2021 18:10 Oggetto: Position at the Erdõs Center (Budapest) Dear colleagues, We would like to announce a research semester in "Singularities and low dimensional topology", which will take place in Budapest from February 2023 to June 2023. More details can be found at https://erdoscenter.renyi.hu/articles/singularities-and-low-dimensional-top… Connected to the research semester, we announce: - a number of 6-month or 1-year postdoc positions; - a number of visiting professor positions. The deadline for applying (for both) is 28 February 2022. Here are the links to the job announcements: - postdoc positions: https://erdoscenter.renyi.hu/sites/default/files/jobs/documents/PostdocSLDT… - visiting positions: https://erdoscenter.renyi.hu/sites/default/files/jobs/documents/Visiting23.… Please forward this email to anyone who may be interested in applying. Best wishes, András Stipsicz

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I: Summer school on Alexander polynomials
by Paolo Lisca 17 Dec '21

17 Dec '21

Inoltro annuncio di scuola estiva. Paolo Lisca ________________________________ Da: Marco Golla <marco.golla(a)univ-nantes.fr> Inviato: venerdì 17 dicembre 2021 16:26 Oggetto: Summer school on Alexander polynomials Dear colleagues, We are organising a summer school on Alexander polynomials at the University of Nantes (May 30-June 3, 2022). There will be two mini-courses, one by Fathi Ben-Aribi (Université Catholique de Louvain) on twisted Alexander polynomials in the context of classical knot theory and one by Vincent Florens (Université de Pau) on Alexander polynomials and complex projective curves. We expect to have some contributed talks by young participants. The schedule will be pretty light, in order to allow the participants ample time to work on the material covered in the lectures. Some familiarity with knot theory and with (very basic) complex projective geometry will be assumed. You can find more information on the webpage of the school: https://www.math.sciences.univ-nantes.fr/~golla/docs/schools/school-alexand… . The registration page is here: https://www.math.sciences.univ-nantes.fr/AlexanderPolynomials/ and the registration deadline is March 30, 2022. You can contact us at the email address Alexander.Polynomials (at) univ-nantes.fr. Could you pass this information on to any PhD student/postdoc, or even motivated Master student, who might be interested in attending? Funding is available for students who will be selected to give a talk. However, should funding be an insurmountable issue, do ask them to get in touch (Alexander.Polynomials (at) univ-nantes.fr). Thank you! The organisers, Erwan Brugallé, Marco Golla, and François Laudenbach

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I: Postdoc at the University of Vienna in Low dimensional Topology
by Paolo Lisca 16 Dec '21

16 Dec '21

Segnalo una posizione post-doc a Vienna per l'anno prossimo. Paolo Lisca

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Seminario di Combinatoria, Teoria di Lie e Topologia - 9 Dicembre 2021 - Giovanna Carnovale
by Francesco Sala 06 Dec '21

06 Dec '21

Carə tuttə, Vi scrivo per annunciarvi che questo giovedì 9 Dicembre 2021 vi sarà un seminario in presenza per il ciclo di seminari "Seminario di Combinatoria, Teoria di Lie e Topologia” di Pisa. Il seminario si svolgerà in Aula Seminari dalle 15 alle 16. L'oratrice è Giovanna Carnovale (Università di Padova). — Titolo: Approximations of a Nichols algebra from a geometric point of view Abstract: The talk is based on an ongoing joint project with Francesco Esposito and Lleonard Rubio y Degrassi. Nichols (shuffle) algebras are a family of graded Hopf algebras (in a braided monoidal category) which includes symmetric algebras, exterior algebras and the positive part of quantized enveloping algebras. They are crucial in the classification of (pointed) Hopf algebras. However, it is very difficult to describe their relations or to estimate their dimensions in general and new tools are very welcome. We will exploit an equivalence due to Kapranov and Schechtman between a category of graded bialgebras in a braided monoidal category V and the category of factorizable systems of perverse sheaves on all symmetric products Sym^n(C) with values in V. I will describe the factorizable perverse sheaves counterpart of some algebraic constructions, including the n-th approximation of a graded bialgebra. Since the image of Nichols algebras through Kapranov and Schechtman equivalence is very precise, we can translate into geometric statements when a Nichols algebra is finitely presented, or coincides with any of its approximations. — (Qualora pensiate di venire, per aiutarmi nella stesura del documento di tracciamento, vi prego di iscrivervi qui) Vi prego di inoltrare questo messaggio a tutti coloro che ritenete possano essere interessati. Sperando di vedervi numerosi, vi mando i miei saluti, Francesco

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Seminario di Combinatoria, Teoria di Lie e Topologia - 2 Dicembre 2021 - Andrea Appel
by Francesco Sala 01 Dec '21

01 Dec '21

Carə tuttə, Vi scrivo per annunciarvi che domani vi sarà un seminario in presenza per il ciclo di seminari "Seminario di Combinatoria, Teoria di Lie e Topologia” di Pisa. Il seminario si svolgerà in Aula Magna dalle 15 alle 16. L'oratore è Andrea Appel (Università di Parma). — Titolo: Generalized Schur-Weyl duality for quantum affine symmetric pairs and orientifold KLR algebras Abstract: In the work of Kang, Kashiwara, and Kim, the Schur–Weyl duality between quantum affine algebras and affine Hecke algebras is extended to certain Khovanov-Lauda-Rouquier (KLR) algebras, whose defining com- binatorial datum is given by the poles of the normalized R–matrix on a set of representations. In this talk, I will describe a boundary version of this construction, providing a Schur–Weyl duality between quantum symmetric pairs of affine type and KLR algebras arising from a framed quiver with an involution. With respect to the Kang-Kashiwara-Kim construction, the extra combinatorial datum we take into account is given by the poles of the k–matrix (that is, a solution of the reflection equation) of the quantum symmetric pair. This is based on joint work in progress with T. Przezdziecki. — (Qualora pensiate di venire, per aiutarmi nella stesura del documento di tracciamento, vi prego di iscrivervi qui) Vi prego di inoltrare questo messaggio a tutti coloro che ritenete possano essere interessati. Sperando di vedervi numerosi, vi mando i miei saluti, A presto, Francesco

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