Bollettino settimanale
Pagina d'informazione di seminari ed eventi scientifici che avranno luogo settimanalmente per lo più in area romana.
Per la pubblicazione rivolgersi a Giorgio Chiarati che ne cura la gestione.
Per consultare la pagina di tutti i seminari di Dipartimento Click here.
Settimana 19/01/2025 - 23/01/2025
Seminari
Nel link sottostante trovate la Newsletter n.5 del progetto di Dipartimento MatMod@TOV, con l'invito di leggerla ed a darne massima diffusione:
Click below for PDF file Download:
NEWSLETTER n.5
Università degli Studi Roma Tor Vergata
Dipartimento di Matematica
Geometry Seminar
Date: 20 January 2026
Schedule: 14:30 Rome Time
Where: Conference Room 1101 "C. D'Antoni"
Speaker: Madhavan Venkatesh - MPI Saarbrücken;
Title: " Counting points on surfaces "
Abstract:
I will present a randomised algorithm to compute the local zeta function of a fixed smooth, projective surface over the rationals,
at any large prime p of good reduction. The runtime of the algorithm is polynomial in log p, answering a
question of Couveignes and Edixhoven. The main ingredient is to explicitly compute cocycles associated to a Lefschetz pencil on the surface.
This is based on joint work with Nitin Saxena.
Note: This talk is part of the activity of the MIUR Department of Excellence Project MatMod@TOV (2023-2027), Prin 2022 Moduli Spaces and Birational Geometry and Prin PNRR 2022 Mathematical Primitives for Post Quantum Digital Signatures
Organizing Committee:
Codogni Giulio (Contact Mail)
Lido Guido Maria ( Contact Mail)
Francesca Carocci ( Contact Mail)
Further Information: Click here for geometry webpage
Streaming Link (MS Teams): This seminar will be held in person
Università degli Studi Roma Tor Vergata
Dipartimento di Matematica
DIFFERENTIAL EQUATIONS SEMINAR
Date: 20 January 2026
First Seminar at 14:30 p.m.
Schedule: 14:30 - Rome Time -
Where: Conference Room "R. Dal Passo "
Title: " Extremals for Poincaré-Sobolev sharp constants in Steiner symmetric sets "
Speaker: Francesca Prinari - Università di Pisa
Abstract:
We prove existence of minimizers for the sharp Poincaré-Sobolev constant in general Steiner symmetric sets, in the subcritical and superhomogeneous regime.
The sets considered are not necessarily bounded, thus the relevant embeddings may suffer from a lack of compactness. We prove existence by means of an elementary compactness method. We also prove an exponential decay at infinity for minimizers, showing that in the case of Steiner symmetric sets the relevant estimates only depend on the underlying geometry. Finally, we illustrate the optimality of the existence result, by means of some examples.
Based on a joint work in collaboration with L. Brasco and L. Briani
Second Seminar at 16:00 p.m.
Schedule: 16:00 - Rome Time -
Where: Conference Room "R. Dal Passo "
Title: "Singularities and generalized Hamiltonian gradient flow: From dynamics to transport "
Speaker: Wei Cheng - Nanjing University
Abstract:
We will begin by reviewing classical results in the dynamics of Lagrangian flows, primarily within the framework of Aubry-Mather theory and weak KAM theory. From the perspective of transport, the regular Lagrangian flow determined by these theories establishes a connection between viscosity solutions of the Hamilton-Jacobi equation and optimal transport. Over the past decade, we and our collaborators have developed an intrinsic approach to study the singularities and their evolution in the Hamilton-Jacobi equation. In particular, the theory of Hamiltonian generalized gradient flows that we have developed in recent years has preliminarily established a transport theory for the corresponding potential functionals in the context of irregular Lagrangian flows. We have reason to believe that we can further explore transport problems related to entropy functionals and free energy functionals, as well as issues ranging from the structure of the cut locus in deterministic systems, the existence of invariant measures beyond Mather, to vanishing viscosity and zero-temperature limits.
This is a relatively open field, and we will discuss both existing achievements and future expectations.
Nota: Questo seminario fa parte delle attività finanziate dal progetto MIUR Dipartimento d'eccellenza MatMod@TOV (2023-27) CUP E83C23000330006
Note: This talk is part of the activity of the MIUR Excellence Department Project MatMod@TOV (2023-27) CUP E83C23000330006
Organizing Committee:
Riccardo Molle (mail to contact)
Alfonso Sorrentino (mail to contact)
Further Info and Program: Click here
Streaming Link (MS Teams): This seminar will be held in person
Università degli Studi Roma Tor Vergata
Dipartimento di Matematica
Storia delle Matematiche Seminar
Date: 21 January 2026
Schedule: 14:30 Rome Time
Where: Math Conference Room 2001
Speaker: Veronica Gavagna - Università di Firenze
Title: "L'Algebra di Rafael Bombelli e si suoi testimoni manoscritti: nuove prospettive di ricerca "
Abstract:
This talk is part of the activity of the MIUR Excellence Department Projects MathMod@TOV CUP E83C23000330006.
Organizing Committee:
Riccardo Bellè (Contact Mail)
Further Information: contact Bellé's Mail
Streaming Link (MS Teams): This seminar will be held in presence.
Università degli Studi di Roma "Tor Vergata"
Dipartimento di Matematica
Algebra and Representation Theory Seminar
Date: Friday 23 January 2026
Schedule:
FIRST SEMINAR 14:30 Rome Time
SECOND SEMINAR 16:00 Rome Time
Where: Conference 1201 - Room Dal Passo
FIRST SEMINAR 14:30 Rome Time
Speaker: Peter SCHAUENBURG - Université de Bourgogne
Title: " T.B.A. "
Abstract:
Tensor categories (and their module categories) take center stage in many interactions between algebra and low-dimensional topology inspired by physics.
If we are lucky enough, a useful tensor category can be described neatly as the representation category of a suitable Hopf algebra, and any further
embellishments of the situation can be described in terms of that Hopf algebra; in fact one can argue that this is exactly what Hopf algebras are for.
We visit a recent installment of such a connection. Laugwitz-Walton-Yakimov introduce the "reflective center" of a module category over a braided tensor
category (setting aside for this abstract any technical requirements of course). The notion of a braided tensor category is closely related to
(representations of) the Artin braid group (of type A), and in the same fashion the braided module category constructed by Laugwitz-Walton-Yakimov
is related to the Artin braid group of type B which is to a Weyl group of type B what the Artin braid group of type A is to the symmetric group.
If the braided tensor category is the module category of a Hopf algebra H, and the module category is described by an algebra with an H-action,
Laugwitz-Walton-Yakimov construct a new algebra with H-action describing the "reflective center". This "reflective algebra" is parallel in a
sense to the famous Drinfeld double construction producing, from any Hopf algebra, a new Hopf algebra whose module category is braided.
After explaining what all this is about, we humbly redo the reflective algebra construction of Laugwitz-Walton-Yakimov in a more conceptual
(and slightly selfish) way, making full use of Majid's "transmuted" Hopf algebra and a peculiar and often overlooked structure the latter enjoys.
Note: this talk is part of the activity of the MIUR Excellence Department Project MatMod@TOV (CUP E83C23000330006).
SECOND SEMINAR 16:00 Rome Time
Speaker: Luca VITAGLIANO - Università di Salerno
Title: "Shifted Contact Structures on Differentiable Stacks "
Abstract:
Differentiable stacks are a class of singular spaces in differential geometry including orbifolds,
leaf spaces of foliations and orbit spaces of Lie group actions. One possible definition is: a
differentiable stack is a Morita equivalence class of Lie groupoids. It follows from this definition that geometry
on differentiable stacks is more or less the same as Morita invariant geometry of Lie groupoids. Following this principle,
several different geometries on differentiable stacks have been introduced and studied recently, including vector fields,
differential forms, symplectic and Poisson structures, with several applications in Poisson geometry and mathematical physics.
In this talk, I will first review Lie groupoids, Morita equivalence and differentiable stacks.
In the second part of the talk, based on joint work with A. Maglio and A. Tortorella,
I will briefly discuss contact structures on differentiable stacks.
Note: this talk is part of the activity of the MIUR Excellence Department Project MatMod@TOV (CUP E83C23000330006).
Organizing Committee:
Fabio Gavarini (mail to)
Niels Kowalzig (mail to)
Martina Lanini (mail to)
Further Info: Click here for A.R.T.S. Webpage
Streaming Link (MS Teams): This seminar will be held in person
Eventi