Notiziario Scientifico
a cura del Dipartimento di Matematica G. Castelnuovo, Sapienza Università di Roma
Settimana dal 01-03-2021 al 07-03-2021
Mercoledì 03 marzo 2021
Ore 14:00, Seminario telematico via Google Meet all'URL http://meet.google.com/jjt-toji-skw, Dipartimento di Matematica, Sapienza Università di Roma
seminario di Algebra e Geometria
Richard Wentworth (University of Maryland)
Conformal limits of parabolic Higgs bundles
Gaiotto introduced the notion of a conformal limit of a Higgs bundle and conjectured that these should identify the Hitchin component with the Oper stratum in the deRham moduli space. In the case of closed Riemann surfaces this result was proven by Dumitrescu, et al., and the limits were shown to exist much more generally by Collier and the speaker. In this talk I will report on progress in the case of parabolic Higgs bundles, which were the context of Gaiotto's original conjecture. This is joint work with B. Collier and L. Fredrickson.
Per informazioni, rivolgersi a: diverio@mat.uniroma1.it
Mercoledì 03 marzo 2021
Ore 14:30, teleconferenza https://meet.google.com/pip-kvzt-fkz, Dipartimento di Fisica, Sapienza Università di Roma
Seminario delle Meccaniche
Pedro Garrido (Instituto Carlos I de Física Teórica y Computacional. Universidad de Granada)
Transport Properties of Hard Disks Systems
Hard particle systems are among the most successful, inspiring, and prolific models of physics. They contain the essential ingredients to understand a large class of complex phenomena. Their study also provides crucial insights into the problem of transport out of equilibrium. The main tool in this endeavor is computer simulations that permit a detailed description of their properties. In this talk, we review some of our work in this direction ranging from local equilibrium and Fourier’s law to the transition to convective flow in the presence of gravity, the efficiency of boundary dissipation, or the universality of anomalous transport in low dimensions.
Mercoledì 03 marzo 2021
Ore 16:00, Online seminar, Dipartimento di Matematica, Università di Roma "Tor Vergata"
Seminario di Algebre di Operatori
Alexander Stottmeister (University of Hannover)
Operator-algebraic renormalization, fermions and conformal field theory
We will discuss the application of the recently introduced framework of operator-algebraic renormalization to fermionic lattice systems. Focussing on the 1+1-dimensional situation, we will illustrate how the scaling limit of the massless free fermion can be obtained. Moreover, we will show how conformal symmetry can be approximated in terms of a proposal by Koo & Saleur. Link Seminario
Per informazioni, rivolgersi a: morinell@mat.uniroma2.it
Giovedì 04 marzo 2021
Ore 14:00, Seminario online su questo link, Dipartimento di Matematica, Università di Roma "Tor Vergata"
Seminario di Analisi Matematica
Weiwei Ao (Wuhan University)
Symmetry and symmetry breaking for the fractional Caffarelli-Kohn-Nirenberg inequality
In this talk, I will discuss about a fractional version of the Caffarelli-Kohn-Nirenberg inequality. We first study the existence and nonexistence of extremal solutions. We also show some results for the symmetry and symmetry breaking region for the minimizers. In order to get these result we reformulate the fractional Caffarelli-Kohn-Nirenberg inequality in cylindrical variables. We also get the non-degeneracy and uniqueness of minimizers in the radial symmetry class. This is joint work with Azahara DelaTorre and Maria del Mar Gonzalez.
NB:This talk is part of the activity of the MIUR Excellence Department Project MATH@TOV CUP E83C18000100006
Per informazioni, rivolgersi a: molle@mat.uniroma2.it
Giovedì 04 marzo 2021
Ore 14:30, Canale Youtube di Cnr-IAC https://www.youtube.com/watch?v=CkuQQXg9w6Y, Istituto per le Applicazioni del Calcolo, Consiglio Nazionale delle Ricerche
Seminari generali IAC 2021
Alessandro Celestini (Istituto per le Applicazioni del Calcolo, Consiglio Nazionale delle Ricerche)
A Model for Urban Social Networks
Building accurate and flexible models for real-world social networks supporting the simulations of dynamic processes, is instrumental to analyse the phenomena taking place across those networks. To fill the gap between simple random graph models and empirical contact networks, we proposed and implemented a flexible model to generate age-stratified and geo-referenced synthetic social networks. The model uses: gridded population density data, aggregated demographic data, and, when available, estimated age-based social mixing patterns. In this talk, I will present the model, report on experiments focused on a few Italian cities, and discuss an epidemiological case study.
Per informazioni, rivolgersi a: roberto.natalini@cnr.it
Giovedì 04 marzo 2021
Ore 14:30, Il seminario sarà tenuto in modalità telematica, Dipartimento di Matematica e Fisica, Università degli Studi RomaTre, Largo San Leonardo Murialdo 1
Seminario di Geometria
Soheyla Feizbakhsh
Moduli spaces on the Kuznetsov component of cubic threefolds
Consider the non-trivial part of a semi-orthogonal decomposition of the derived category of a cubic threefold, called Kuznetsov component. In this talk, I will first examine S-invariant Bridgeland stability conditions on the Kuznetsov component which are basically unchanged after the action of the Serre functor S. Then I will describe certain moduli spaces of stable objects with respect to these stability conditions. As an application, I will show a categorical version of the Torelli theorem for cubic threefolds, which says that the cubic threefold can be recovered from its Kuznetsov component. This talk is based on joint work in progress with Laura Pertusi and a group project with A.Bayer, S.V. Beentjes, G. Hein, D. Martinelli, F. Rezaee and B. Schmidt. Per partecipare al Seminario cliccare sul seguente Link
Giovedì 04 marzo 2021
Ore 14:30, Sala di Consiglio - https://meet.google.com/ads-dekx-bgm, Dipartimento di Matematica, Sapienza Università di Roma
Seminario P(n)
Isabella Ianni (SBAI-Sapienza Università di Roma)
Radial and non-radial solutions for the Lane-Emden problem in the disk
We discuss sharp asymptotic analysis results on all the radial solutions of the Lane-Emden problem in the disk. In particular, we derive a Morse index formula and deduce multiplicity of solutions. The talk is based on results mainly contained in [ADI], [IS], [GI] and [DIP]. [ADI] A. Amadori, F. De Marchis, I. Ianni, Morse index computation for radial solutions of the Henon problem in the disk, preprint [IS] I. Ianni, A. Saldaña, Sharp asymptotic behavior of radial solutions of some planar semilinear elliptic problems, preprint. [GI] I. Ianni, F. Gladiali, Quasi-radial solutions for the Lane-Emden problem in the ball, NoDEA 27 (2) (2020) [DIP] F. De Marchis, I. Ianni, F. Pacella, Exact Morse index computation for nodal radial solutions of Lane-Emden problems, Mathematische Annalen 367 (2017)
Per informazioni, rivolgersi a: galise@mat.uniroma1.it
Giovedì 04 marzo 2021
Ore 15:00, Il seminario sarà tenuto in modalità telematica, Link per partecipare: https://uniroma1.zoom.us/j/85943796292?pwd=dDliSTJBTFVmazRNYXZGV0lBVUJCZz09
Seminari di Ricerca in Didattica della Matematica
Claudio Bernardi (Sapienza Università di Roma)
Su alcuni paradossi matematici meno noti
Venerdì 05 marzo 2021
Ore 15:00, Il seminario sarà tenuto in modalità telematica, Dipartimento di Matematica e Fisica, Università degli Studi RomaTre, Largo San Leonardo Murialdo 1
Seminario di Logica e Informatica Teorica
Chien-Chung Huang (CNRS / École Normale Supérieure PSL, Paris)
Minimizing the Number of Unhappy Singles: Improved Approximation Algorithms for Stable Marriage
We consider the problem of computing a large stable matching in a bipartite graph G = (A ∪ B, E) where each vertex u ∈ A ∪ B ranks its neighbors in an order of preference, perhaps involving ties. Let the matched partner of u in a matching M be M(u). A matching M is said to be stable if there is no edge (a,b) such that a is unmatched or prefers b to M(a) and similarly, b is unmatched or prefers a to M(b). While a stable matching in G can be easily computed in linear time by the Gale-Shapley algorithm, it is known that computing a maximum size stable matching is APX-hard. We design an algorithm to give a 1.4667-approximation for the special case where all ties of the preferences appear on the B-side. This algorithm is purely combinatorial and takes only linear time.
Per partecipare al Seminario cliccare sul seguente Link
Venerdì 05 marzo 2021
Ore 16:00, Il seminario sarà tenuto in modalità telematica, Link per partecipare: https://uniroma1.zoom.us/meeting/register/tZwtcOGqqzkpE9yen93NMtuUttv031ZmB9lt
Seminari per insegnanti (PLS)
Luca Biasco (Università Roma Tre)
Perché le note sono sette, o meglio, perché i semitoni sono dodici
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