Care tutte, cari tutti, Inoltro il seguente annuncio di un seminario di Fisica-Matematica che può essere di interesse anche per un pubblico più vasto. Lunedì 17 aprile 2026, ore 14, in Aula Seminari Matteo Gallone (Milano, La Statale) terrà un seminario<https://www.dm.unipi.it/seminario/?id=69e393af84f0900654e87dfa> dal titolo "Prethermalization and quasi-conserved quantities in Many-Body quantum systems with time-dependent Hamiltonians”. Trovate l’abstract qui sotto. A presto, Luigi ----------------------------------- Dear all, I am pleased to forward the announcement of an upcoming Math-Physics seminar that may be of interest to a broad audience. On Monday, April 27, 2 pm, in Aula Seminari Matteo Gallone (Milano, La Statale) will give a talk<https://www.dm.unipi.it/seminario/?id=69e393af84f0900654e87dfa> with title "Prethermalization and quasi-conserved quantities in Many-Body quantum systems with time-dependent Hamiltonians”. You will find the abstract below. See you soon, Luigi ----------------------------------- Speaker: Matteo Gallone (University of Milan, La Statale) Title: Prethermalization and quasi-conserved quantities in Many-Body quantum systems with time-dependent Hamiltonians Abstract: Understanding thermalization, i.e. the relaxation of a physical system to thermal equilibrium, is a central problem in statistical physics. It is now well established that the presence of non-trivial quasi-conserved quantities can significantly slow down this process, leading to long-lived quasi-stationary states known as prethermal states. The approach to such states is referred to as prethermalization. In many-body quantum systems, external driving provides a powerful mechanism to engineer and control prethermal states. In the absence of many-body localization, general theoretical arguments predict that time-dependent perturbations ultimately drive the system toward a featureless infinite-temperature Gibbs state. However, both rigorous results and experiments show that, under fast periodic driving, fermionic quantum lattice systems can exhibit exponentially long-lived prethermal regimes, largely independent of the regularity of the drive. The situation becomes even richer for quasi-periodic driving, i.e., when the system is driven by a superposition of incommensurate frequencies. In this case, the regularity of the driving plays a crucial role in determining the lifetime of the prethermal regime. In this talk, I will review the problem and survey recent rigorous results, focusing in particular on the case of finitely differentiable drivings. In this setting, the prethermal state persists for polynomially long times in the driving frequency. I will also explain how to determine the optimal exponents governing this behavior. The analysis combines techniques from Hamiltonian perturbation theory adapted to quantum lattice systems, cluster expansions, and Lieb–Robinson bounds. This is joint work with Beatrice Langella. ----------- Luigi Forcella, Associate Professor University of Pisa Department of Mathematics Largo Bruno Pontecorvo 5 57127 Pisa, Italy https://pagine.dm.unipi.it/forcella/index.html