Settimana 08/04/2024 - 12/03/2024

 

• Seminari

• Eventi

• Archivio Bollettini

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Seminari

 

Università degli Studi Roma Tor Vergata
Dipartimento di Matematica

 

Geometry Seminar

Date: 9th April 2024

Schedule: 14:30 Rome Time

Where: Conference Room 1101 "C. D'Antoni"

Speaker: Ruijie Yang - Humboldt-Universitä

Title: " Minimal exponent of a hypersurface "

Abstract: In this talk, I will go back to the origin of the minimal exponent and give a brief history on how it naturally arises in the context of integration over vanishing cycles (Arnold-Varchenko), counting integer solutions of congruence equations (Igusa) and Archimedean zeta functions (Atiyah, Bernstein, Loeser). Then I will talk about some joint work in progress with Dougal Davis (on birational formula of higher multiplier ideals via Beilinson’s formula from Jansen’s conjecture in geometry representation theory) and Ming Hao Quek (on birational characterization of minimal exponents via toric geometry and multi weighted blow-ups). This talk is part of the activity of the MIUR Excellence Department Projects MathMod@TOV, and the PRIN 2022 Moduli Spaces and Birational Geometry

Organizing Committee:
Codogni Giulio (Contact Mail)
Lido Guido Maria ( Contact Mail)

Further Information: Click here for geometry webpage

Streaming Link (MS Teams): This seminar will be held in person

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Università degli Studi Roma Tor Vergata
Dipartimento di Matematica

 

Operator Algebras Seminar

Date: 10th April 2024

Schedule: 16:00 - Rome Time

Where: Conference Room 1201 "R. Dal Passo"

Title: " Superselection theory as a covariant cohomology "

Speaker: Fabio Ciolli - University of Calabria

Abstract: I Since 1976 J.E. Roberts introduced a non-Abelian 1-cohomology of charge-transporters on the Haag-Kaster networks, and as early as 1990 he proved that this cohomology gives a category equivalent to the one of the DHR sectors of the (Haag dual) net of the observables on the Minkowski d=1+3. In the DHR framework, the covariance of the sectors by the geometric symmetry is introduced through the vacuum representation and morphisms. Quite recently, with G. Ruzzi and E. Vasselli, motivated by theories on a globally hyperbolic spacetime and by sectors with electric charges, as in the analysis by Buchholz and Roberts, we introduced a novel cohomology covariant under the geometric symmetry, for simply connected spacetimes. I will discuss these recent results and some open problems about non-simply connected spacetimes.

Organizing Committee:
Vincenzo Morinelli (mail to contact)
Roberto Longo (mail to contact)
Daniele Guido (mail to contact)
Giuseppe Ruzzi (mail to contact)

Further Info: Click here for Operator Algebras Seminar Page

Streaming Link (MS Teams): This seminar will be held in person

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Università degli Studi Roma Tor Vergata
Dipartimento di Matematica

 

DIFFERENTIAL EQUATIONS SEMINAR

Date: 09th April 2024

Schedule: 16:00 - Rome Time

Where: Conference Room "R. Dal Passo"

Title: " Some existence results for the nonlinear Schrödinger equation on Riemannian manifolds "

Speaker: Luigi Appolloni - University of Leeds

Abstract: Over the last few decades, the study of the nonlinear Schrödinger equation on $\mathbb{R}^N$ has been investigated by numerous researchers. However, very few results are known when the domain is non-Euclidean. In this talk, we will see some recent results regarding the existence and multiplicity of solutions for the nonlinear Schrödinger equation on non-compact Riemannian manifolds. In particular, we will focus our attention to the interplay between the necessary assumptions on the potential in the Schrödinger operator and those on the manifold.
Nota: Questo seminario fa parte delle attività finanziate dal progetto MIUR Dipartimento d'eccellenza MatMod@TOV (2023-27)
Note: This talk is part of the activity of the MIUR Excellence Department Project MatMod@TOV (2023-27)

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

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Università degli Studi Roma Tor Vergata
Dipartimento di Matematica

 

RoMaDS - Rome Centre on Mathematics for Modelling and Data ScienceS

Date: April 10th 2024

First Seminar

Schedule: 14:30 - Rome Time

Where: Conference Room R. Dal Passo

Title: " Towards a logarithmic conformal field theory of 2D critical percolation "

Speaker: Federico Camia - NYU Abu Dhabi

Abstract: Conformal field theory (CFT) provides a very powerful framework to study the large-scale properties of models of statistical mechanics at their critical point. The prototypical example of this is the continuum (scaling) limit of the two-dimensional critical Ising model. The case of critical percolation is more difficult, partly because its continuum limit is believed to be described by a relatively unusual type of CFT, called a logarithmic CFT. In this talk, I will first briefly explain the statements above. I will then present some recent results and work in progress that are part of a program aimed at fitting percolation within the logarithmic CFT framework.

Nota: Questo seminario fa parte delle attività finanziate dal progetto MIUR Dipartimento d'eccellenza MAT@Mod CUP E83C23000330006
Note: This talk is part of the activity of the MIUR Excellence Department Project MAT@Mod CUP E83C23000330006

Second Seminar

Schedule: 16:30 - Rome Time

Where: Conference Room R. Dal Passo

Title: " Mixing cutoff for simple random walks on the Chung-Lu directed graph "

Speaker: Alessandra Bianchi - Univesrity of Padova

Abstract: In this talk, we consider a simple random walk defined on a Chung-Lu directed graph, an inhomogeneous random network that extends the Erdos Renyi random digraph by including edges independently according to given Bernoulli laws. In this non-reversible setting, we will focus on the convergence toward the equilibrium of the dynamics. In particular, under the assumption that the average degree grows logarithmically in the size n of the graph (weakly dense regime), we will establish a cutoff phenomenon at the entropic time of order log(n)/loglog(n). We will then show that on a precise window the cutoff profile converges to the Gaussian tail function. This is qualitatively similar to what was proved in a series of works by Bordenave, Caputo, Salez for the directed configuration model, where degrees are deterministically fixed. In terms of statistical ensembles, this analysis provides an extension of these cutoff results from a hard to a soft-constrained model.
Joint work with G. Passuello.

Nota: Questo seminario fa parte delle attività finanziate dal progetto MIUR Dipartimento d'eccellenza MAT@Mod CUP E83C23000330006
Note: This talk is part of the activity of the MIUR Excellence Department Project MAT@Mod CUP E83C23000330006

Organizing Committee:
Domenico Marinucci (coordinator)
Michele Salvi
Stefano Vigogna

Further Info and Program: Click here for RoMaDS event Page

Streaming Link (MS Teams): Link TEAMS Click here

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Università degli Studi di Roma "Tor Vergata"
Dipartimento di Matematica

 

Algebra and Representation Theory Seminar

Date: Friday April 12 th, 2024

Schedule: 16:00 Rome Time

Where: Conference Room 1201 “Roberta Dal Passo”

Speaker: Grant Barkley - University of Harvard

Title: "Hypercube decompositions and combinatorial invariance for elementary intervals "

Abstract:

The combinatorial invariance conjecture asserts that the Kazhdan-Lusztig (KL) polynomial of an interval [u,v] in Bruhat order can be determined just from the knowledge of the poset isomorphism type of [u,v]. Recent work of Blundell, Buesing, Davies, Velicković, and Williamson posed a conjectural recurrence for KL polynomials depending only on the poset structure of [u,v]. Their formula uses a new combinatorial structure, called a hypercube decomposition, that can be found in any interval of the symmetric group. We give a new, simpler, formula based on hypercube decompositions and prove it holds for "elementary" intervals: an interval [u,v] is elementary if it is isomorphic as a poset to an interval with linearly independent bottom edges. As a result, we prove combinatorial invariance for Kazhdan-Lusztig R-polynomials of elementary intervals in the symmetric group, generalizing the previously known case of lower intervals.
This is a joint work with Christian Gaetz.
N.B.:
(1): the talk will be colloquium-style and aimed at a wide audience: no prerequisite of deep algebraic nor group theoretic knowledge is required;
(2): 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 webpage

Streaming Link (MS Teams): This seminar will be held in person

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Università degli Studi di Roma "Tor Vergata"
Dipartimento di Matematica

 

Algebra and Representation Theory Seminar

Date: Friday April 12th, 2024

Schedule: 14:30 - Rome Time

Where: Conference Room 1201 “Roberta Dal Passo”

Speaker: Willem DE GRAAF - Università di Trento

Title: "Classifying orbits of complex and real Vinberg representations"

Abstract:

Vinberg representations are representations of algebraic groups that arise from a cyclic grading of a semisimple Lie algebra. In the literature they are mainly known as theta-groups or Vinberg pairs. A distinguishing feature of these representations is that it is possible to classify the orbits of the algebraic group. We sketch how this can be done when the base field is the complex numbers. This mainly uses results of Vinberg of the 70's. Then we describe techniques for classifying the orbits when the base field is the real numbers. This talk is based on joint work with Mikhail Borovoi, Hong Van Le, Heiko Dietrich, Marcos Origlia, Alessio Marrani.
N.B.: 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 webpage

Streaming Link (MS Teams): This seminar will be held in person

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Eventi

 

Università degli Studi di Roma "Tor Vergata"
Dipartimento di Matematica

PhD Course
Optimal control of large systems and mean-field games

Period: 11.04.24 - 20.05.24

Speaker: Prof. Cardaliaguet Pierre - Université Paris Dauphine

Schedule:

11/04/24, 15:00 - 18:00 Aula D'Antoni
15/04/24, 15:00 - 18:00 Aula D'Antoni
18/04/24, 15:00 - 18:00 Aula D'Antoni
22/04/24, 15:00 - 18:00 Aula D'Antoni
02/05/24, 15:00 - 18:00 Aula D'Antoni
06/05/24, 15:00 - 18:00 Aula D'Antoni
13/05/24, 15:00 - 18:00 Aula D'Antoni
15/05/24, 15:00 - 18:00 Aula D'Antoni
20/05/24, 15:00 - 18:00 Aula D'Antoni

• PhD's Program

Organizing Committee:
Alessio Porretta (Contact Mail for PHD information)

Further Information: Click here for Phd Course Page

Streaming Link (MS Teams): This seminar will be held in person

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