

201516/
Seminari A.A. 20152016 

I Seminari si svolgono il martedì alle 14:30 nell'aula 311
del Dipartimento di Matematica
(salvo diversa indicazione)



Relatore 
Titolo 
Data 



Emanuela Laura Giacomelli
Università di Roma "La Sapienza" 

7 Giugno 2016 



Valentin Zagrebnov
Université AixMarseille 

17 Maggio 2016 



Davide Chiuchiù
Università di Perugia 

3 Maggio 2016 



Marco Falconi
Università Roma Tre 

26 Aprile 2016 



Florian Theil
University of Warwick 

19 Aprile 2016 



Spyros Sotiriadis
Università Roma Tre 

12 Aprile 2016 



One of the foundations of statistical physics is that only minimal information is required for the description of
macroscopic systems. Research in quantum onedimensional integrable systems
outofequilibrium has recently revealed relaxation towards a nonthermal statistical ensemble that violates this
principle due to the presence of an infinite number of local integrals of
motion. The information content of this ensemble remains however a riddle. By studying the dynamics after suddenly
switchingoff the interactions in an isolated quantum system (a socalled
quantum quench), we will show that the time evolution under a massive Gaussian field theory erases all memory of
nonGaussian correlations that are present in the initial state, keeping
information only about the initial twopoint correlation function. On the other hand, in the massless case in one
spatial dimension we will show that an enormous amount of information about
the initial state survives even at infinitely large times, in contrast to earlier expectations. We provide an
intuitive explanation of the above results based on the cluster decomposition
principle and the hydrodynamic character of the evolution. Lastly we will discuss applications to cold atom
experiments and generalisations to spin chains.




Niels Benedikter
University of Copenhagen 

22 Settembre 2015 




