Università degli Studi Roma Tor Vergata
Dipartimento di Matematica

Date: 19 May 2026

Schedule: h: 14:30 Rome Time

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

Speaker: Xavier Roulleau - Université d'Angers

Title: " Point and line arrangements: moduli spaces and operator actions "

Abstract:
Point and line arrangements in the plane arise in various contexts, including topology (Zariski pairs), algebra (freeness), and combinatorics. Notably, Hirzebruch utilized these configurations to construct specific ball-quotient surfaces. In this talk, I will introduce operators acting on these arrangements and their corresponding parameter spaces. We shall see how certain elliptic modular surfaces and modular curves can be recovered as parameter spaces of point arrangements under the action of these operators.

Note: This talk is part of the activity of the MIUR Department of Excellence Project MatMod@TOV (2023-2027) and 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)
Antonio Trusiani ( 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

Date: Monday 18 May 2026

Schedule: 16:00 - Rome Time

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

Title:" The topological Brower group "

Speaker: Matteo Verni - Sorbonne Universitèe, Paris, France

Abstract:
The topological Brauer group of a (topological) manifold X is nothing more than the torsion subgroup of its third degree singular cohomology. Its name and significance comes from algebraic geometry: for example, it plays a fundamental role in rationality problems. In this talk we will sketch its basic property, usage, and discuss one method of computing it, bringing together topology, group theory and homological algebra, which has seen recent usage.

N.B.: This talk is part of the activity of the MIUR Excellence Department Project Mat-Mod@TOV (CUP E83C23000330006).

Organizing Committee:
Andrea Pizzi (mail to contact)

Further Info and Program: For information contact to Arianna Vicari or Andrea Pizzi directly by E-mail.

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

Università degli Studi Roma Tor Vergata
Dipartimento di Matematica

Date: 19 May 2026

Schedule: 14:30 - Rome Time

Where: Conference Room: 2001

Title: " Some problems concerning canonical metrics in Hermitian non-Kähler geometry "

Speaker: Daniele Angella - University of Firenze

Abstract:
We investigate several possible notions of "canonical'' metrics that naturally arise in Hermitian non-Kähler geometry. In particular, we study an analogue of the Yamabe problem in the non-Kähler setting, concerning the existence of Hermitian metrics with constant scalar curvature with respect to the Chern connection. We also develop a moment map interpretation of the Chern scalar curvature in the locally conformally Kähler setting. Another tool for highlighting ``canonical structures'' is the Chern–Ricci flow. The long-time behavior of its solutions is expected to reflect the underlying complex structure, and we present some evidence of this in the case of compact complex surfaces. This talk is based on joint work with Simone Calamai, Mauricio Corrêa, Francesco Pediconi, Cristiano Spotti, Valentino Tosatti, and Oluwagbenga Joshua Windare.

Organizing Committee:
Leandro Arosio (mail to contact)
Filippo Bracci (mail to contact)
Eleonora Di Nezza (mail to contact)

Further Info and Program: COMPLEX ANALYSIS SEMINAR page Click here

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

Università degli Studi Roma Tor Vergata
Dipartimento di Matematica

Date: 19 May 2026

Schedule: 14:30 - Rome Time

Where: Conference Room "R. Dal Passo "

Title: " Standing waves for Hartree system with Hardy-Littlewood-Sobolev critical exponentey"

Speaker: Lun Guo - South-Central Minzu University, Wuhan

Abstract:
In this talk, I will give some recent results on the Hartree system with Hardy-Littlewood-Sobolev critical exponent. Under some technical conditions on potentials, we investigate the existence and multiplicity of standing waves by using variational method combined with Brouwer degree theory and Ljusternik-Schnirelmann theory.

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

Date: 20th May 2026

Schedule: 14:00 - Rome Time

Where: Conference Room 1201 " R. Dal Passo"

Speaker: Lothar Reichel - Kent State University

Title: "Randomized iterative methods for inverse problems "

Abstract:
Randomized methods can be applied to speed up the computation of the singular value decomposition of a large matrix of low rank. They also can be used to accelerate the convergence of Krylov subspace methods for the solution of certain linear systems of equations. This talk discusses several approaches to apply randomized methods to the solution of large-scale linear systems of equations that arise when solving linear inverse problems. These kind of problems appear when one seeks to determine the cause of an observed effect.

This talk is part of the activity of the MIUR Excellence Department Projects MathMod@TOV CUP E83C23000330006.

Organizing Committee:
Carla Manni (Contact Mail)
Mariarosa Mazza (Contact Mail)
Hendrik Speleers (Contact Mail)

Further Information: contact Mazza's Mail

Streaming Link (MS Teams): link Team This seminar will be held in mix mode: Teams and presence.

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

Date: Friday 08th May 2026

Schedule:
FIRST SEMINAR 14:30 - Rome Time
SECOND SEMINAR 16:00 - Rome Time

Where: Conference Room 1201 - R. Dal Passo

Speaker: Xujia CHEN - I.S.T.A. Wien

Title: "A product operation on disk fiber bundles and its relation to the Lie bracket in graph homology "

Abstract:
In this talk we will be concerned with smooth, framed fiber bundles whose fibers are the standard d-dimensional disk, trivialized along the boundary. "Kontsevich's characteristic classes" are invariants defined for these bundles: given such a bundle π : E ⟶ B , we can associate to it a collection of cohomology classes in H*(B). On the other hand, there is a "bracket operation" for these bundles defined by Sander Kupers: namely, given two such bundles π1 and π2 as input, we can output a "bracket bundle" [π1, π2]. I will talk about this bracket bundle construction and a formula relating the Kontsevich's class of [π1, π2] with those of π1 and π2 . The main input of the proof is a generalization of the Fulton-MacPherson configuration spaces. This is joint work with Robin Koytcheff and Sander Kupers.

N.B.: this talk is part of the activity of the MIUR Excellence Department Project MatMod@TOV (CUP E83C23000330006).

Speaker: Olivier SCHIFFMANN - CNRS - Paris Saclay

Title: "Khovanov-Lauda-Rouquier type algebras for the projective line "

Abstract:
The Khovanov-Lauda-Rouquier (KLR) algebras associated to quivers have been used to categorify positive halves of quantum enveloping algebras of Kac-Moody algebras. Suitable quotients of these algebras, the cyclotomic KLR algebras, categorize highest weight integrable re-presentations, and also lead to interesting knot and link invariants. In this talk, we will present some work which goes towards an analogous theory in which the quiver gets replaced by a smooth projective curve (the case of the projective line is already interesting).

This is joint work with Fang Yang.
This is joint work with Fabricio Dos Santos and Aleksandr Trufanov.

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