Sala Seminari (Dip. Matematica)

An exact self-similar solution to a branched transport problem

Relatore: 
Michael Goldman
Abstract. In this talk I will show how one can exactly compute the minimizer of a variant of branched transportation arising as a simplified model for pattern formation in type-I superconductors. The proof relies on the natural scaling properties of the problem. A 3D version of this model has recently been derived from the full Ginzburg-Landau model together with S. Conti, S. Serfaty and F. Otto.
Data Seminario: 
Wednesday, May 31, 2017
Aula: 
Sala Seminari (Dip. Matematica)
Ora Fine: 
Saturday, January 1, 0000 - 17:00
Affiliazione: 
CNRS, Laboratoire Jacques-Louis Lions
Ora Inizio: 
Saturday, January 1, 0000 - 16:00

A variational approach to nonlocal curvature motions and to the crystalline mean curvature flow

Relatore: 
Massimiliano Morini
Abstract. In the first part of the talk I will present a comprehensive theory that covers in a unified way a rather large class of (possibly) nonlocal geometric flows bearing a gradient flow structure with respect to suitable generalized perimeters. Within this framework one can establish new existence and uniqueness results as well as recover several examples scattered in the literature. In the second part I will discuss a new distributional formulation that allows one to treat the highly "degenerate" case of crystalline
Data Seminario: 
Wednesday, May 17, 2017
Aula: 
Sala Seminari (Dip. Matematica)
Ora Fine: 
Saturday, January 1, 0000 - 17:00
Affiliazione: 
Universita' di Parma
Ora Inizio: 
Saturday, January 1, 0000 - 16:00

On the quantitative Bossel-Daners Inequality

Relatore: 
Cristina Trombetti
Abstract. The Bossel-Daners is a Faber-Krahn type inequality for the first Laplacian eigenvalue with Robin boundary conditions. We prove a stability result for such inequality.
Data Seminario: 
Wednesday, May 10, 2017
Aula: 
Sala Seminari (Dip. Matematica)
Ora Fine: 
Saturday, January 1, 0000 - 17:00
Affiliazione: 
Universita' di Napoli Federico II
Ora Inizio: 
Saturday, January 1, 0000 - 16:00

Enumerative Properties of Gene tree configurations in species trees

Abstract: New developments concerning the relationships between species trees, representing the branching histories of populations of organisms, and gene trees, which represent the histories of individual genomic regions, have generated new combinatorial structures. These include “coalescent histories” and “ancestral configurations”, structures that for a given gene tree topology and species tree topology encode the different evolutionary configurations of the gene tree in the branches of the species trees.

Data Seminario: 
Thursday, May 11, 2017
Relatore: 
Filippo Disanto
Ora Fine: 
Saturday, January 1, 0000 - 15:00
Aula: 
Sala Seminari (Dip. Matematica)
Ora Inizio: 
Saturday, January 1, 0000 - 14:00

Seminario di Teoria dei numeri - Moduli di Iwasawa e valori speciali di L-funzioni

Relatore: 
Prof. Andrea Bandini

Abstract: numerose informazioni aritmetiche di grande interesse sono
rappresentate (almeno congetturalmente) da valori speciali di L-funzioni,
per esempio l'ordine del gruppo delle classi di un campo di numeri K
dalla zeta di Dedekind di K o il rango di una curva ellittica E dalla
L-funzione di E. La teoria di Iwasawa attraverso lo studio di alcuni
moduli (come i gruppi delle classi e i gruppi di Selmer) fornisce un
approccio algebrico alla costruzione di approssimazioni p-adiche delle

Data Seminario: 
Thursday, May 11, 2017
Aula: 
Sala Seminari (Dip. Matematica)
Ora Fine: 
Saturday, January 1, 0000 - 16:00
Affiliazione: 
Università di Parma
Ora Inizio: 
Saturday, January 1, 0000 - 15:00

Regularization by noise in (2x 2) hyperbolic systems of conservation laws

Relatore: 
C. Olivera

In this talk we study a non-strictly hyperbolic system of conservation law by stochastic perturbation. We show existence and uniqueness of the solution. We do not assume BV-regularity for the initial conditions. The proofs are based on the concept of entropy solution and on the method of charactteristics (under the influence of noise). This is the first result on the regularization by noise in hyperbolic systems of conservation law.

Data Seminario: 
Tuesday, May 23, 2017
Aula: 
Sala Seminari (Dip. Matematica)
Ora Fine: 
Saturday, January 1, 0000 - 11:15
Affiliazione: 
Universidade Estadual de Campinas
Ora Inizio: 
Saturday, January 1, 0000 - 10:15

Convergence of general weakly asymmetric exclusion processes

Relatore: 
K. Matetski

In my ongoing work with J. Quastel we consider spatially periodic growth models built from weakly asymmetric exclusion processes with finite jump ranges and general jump rates. We prove that at a large scale and after renormalization these processes converge to the Hopf-Cole solution of the KPZ equation driven by Gaussian space-time white noise. In contrast to the celebrated result by L. Bertini and G. Giacomin (in the case of the nearest neighbour interaction) and its extension by A. Dembo and L.-C.

Data Seminario: 
Tuesday, May 2, 2017
Aula: 
Sala Seminari (Dip. Matematica)
Ora Fine: 
Saturday, January 1, 0000 - 11:15
Affiliazione: 
University of Toronto
Ora Inizio: 
Saturday, January 1, 0000 - 10:15

Strutture quasi complesse sulle sfere

Relatore: 
Maurizio Parton

"Una varietà complessa è una varietà il cui modello locale è C^n, invece che R^n. Tra le varietà compatte, l'esempio più semplice è probabilmente la sfera S^2 vista come spazio proiettivo complesso CP^1. Quali altre sfere ammmettono una struttura complessa? A tutt'oggi non è chiaro se esistono strutture complesse su S^6.

Data Seminario: 
Friday, April 28, 2017
Aula: 
Sala Seminari (Dip. Matematica)
Ora Fine: 
Saturday, January 1, 0000 - 18:30
Affiliazione: 
Università di Chieti-Pescara
Ora Inizio: 
Saturday, January 1, 0000 - 17:30

Optimizing the fractional power of a Diffusion operator

Abstract. We study an optimization problem with SPDE constraints, which has the peculiarity that the control parameter $s$ is the $s$-th power of the diffusion operator in the state equation. Before moving to the SPDE case, we first describe the result of Sprekels-Valdinoci for the PDE case. Then we discuss a suitable concept of solutions of the state equation and establish pathwise differentiability properties of the stochastic process w.r.t. the fractional parameter $s$. Finally, we show that under certain conditions on the noise, optimality conditions for
Data Seminario: 
Wednesday, April 26, 2017
Relatore: 
Carina Geldhauser
Ora Fine: 
Saturday, January 1, 0000 - 17:00
Aula: 
Sala Seminari (Dip. Matematica)
Ora Inizio: 
Saturday, January 1, 0000 - 16:00

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