Università degli Studi Roma Tre

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 2013-14/
Seminari A.A. 2013-2014
 
 
I Seminari si svolgono il martedì alle 14:30 nell'aula 311 del Dipartimento di Matematica (salvo diversa indicazione)
  
 
Relatore
Titolo
Data
  
 
 
Riccardo Adami
Politecnico di Torino
Ground states for the nonlinear Schrödinger equation on graphs:
to be or not to be?
08 Luglio 2014
(ore 16:00)
  
 
 
Caludio Cacciapuoti
Università dell'Insubria
Point-like limit for a NLS equation with spatially concentrated nonlinearity
24 Giugno 2014
  
 
 
Francesco Zamponi
ENS Paris
Exact computation of the critical exponents of the jamming transition
05 Giugno 2014
(giovedì)
  
 
 
Robert Seiringer
IST Austria
A positive density analogue of the Lieb-Thirring inequalities
15 Aprile 2014
  
 
 
Ian Jauslin
Università
di Roma Tre
Onsager theory for long rods
25 Marzo 2014
  
 
Abstract
ritorna
In his seminal 1949 paper, L. Onsager laid the groundwork for the investigation of nematic phases in systems of long rod-like molecules, which served as a stepping stone in the study of liquid crystals. He considered a simple model of long thin cylinders interacting via a hard core repulsion, in which by truncating the virial expansion for the free energy at second order, one can compute the free energy quite explicitly, and find that there is a first order phase transition from an isotropic phase to an anisotropic one. This result is not rigorous, since a number of approximations are made, chief among which the truncating of the virial expansion. From a mathematical physics perspective, a rigorous adaptation of Onsager's work could prove extremely interesting, since it would provide an example of a spontaneous breaking of a continuous symmetry. This seems, however, to be a substantial challenge. This informal seminar's aim is a more modest one. I will describe Onsager's 1949 paper in some detail, and show how he proved the existence of a nematic transition in the context of Onsager's approximation, i.e. the truncation of the virial expansion.
  
 
 
Alessandro Giuliani
Università
di Roma Tre
The free energy of the quantum Heisenberg ferromagnet:
validity of the spin wave approximation
11 Marzo 2014
  
 
 
Serena Cenatiempo
ETH Zürich
Critical phases for non-relativistic two dimensional interacting bosons:
Renormalization Group results
25 Febbraio 2014
  
 
 
Vieri Mastropietro
Università di Milano
Weyl semimetallic phase in an interacting lattice system
11 Febbraio 2014
  
 
 
Giovanni Gallavotti
INFN Roma 1 e
Accademia dei Lincei
Matrici casuali e analiticità degli esponenti di Lyapunov
28 Gennaio 2014
  
 
 
Federico Bonetto
Georgia Institute
of Technology
Non equilibrium steady state for a simple model of electric current
19 Dicembre 2013
(giovedì ore 16.00
aula 211)
  
 
 
Paolo Buttà
Università di Roma
"La Sapienza"
Boundary effects in the van der Waals' theory of phase transition
12 Dicembre 2013
(giovedì ore 16.00)
  
 
 
Jarmo Hietarinta
University of Turku
Finland
Integrable dynamics: practical applications and abstract theory
05 Dicembre 2013
(giovedì ore 16.00)
  
 
 
Dimitrios Tsagkarogiannis
University of Sussex
Decay of correlations and finite volume corrections
for the free energy in the canonical ensemble
21 Novembre 2013
(giovedì ore 16.00)
  
 
 
Joachim Kerner
Royal Holloway
University of London
Interacting many-particle systems and Bose-Einstein
condensation on general compact quantum graphs
22 Ottobre 2013
  
 
 
Maria G. Westdickenberg
Aachen University
Order and disorder: The competition between energy and entropy
in randomly perturbed systems
17 Settembre 2013
(aula 211)