ELFT HÍRADÓ

[Varga Imre <varga AT neumann.phy.bme.hu>]

                                                 MEGHIVO
                        a BME Fizikai Intezet, Elmeleti Fizika Tanszek
                                             szeminariumara:


                                                Attila Rakos
                        Department of Physics of Complex Systems
                      Weizmann Institute of Science, Rehovot, Izrael

        "Breakdown of Gallavotti-Cohen symmetry for stochastic dynamics"

        Abstract:We consider the behaviour of current fluctuations in 
non-equilibrium
        Markov-processes. These fluctuations have a generic symmetry 
property, which
        is the analogue of the Gallavotti-Cohen fluctuation relation. This 
relation
        was originally derived for deterministic systems and subsequently for
        stochastic dynamics with bounded state-space. However, the range of 
its
        validity is still an intriguing open question. In order to make 
progress in
        this direction, we consider the one-dimensional partially asymmetric
        zero-range process (a paradigmatic lattice gas model) with open 
boundaries.
        Significantly, we find that the distribution of large current 
fluctuations
        does not satisfy the Gallavotti-Cohen symmetry and that such a 
breakdown can
        generally occur in systems with unbounded state space. We also 
discuss the
        dependence of the asymptotic current distribution on the initial 
state of the
        system.

        Helye: BME Fizikai Intezet,
                  Elmeleti Fizika Tanszek
                  Budafoki ut 8.
                  F-epulet, III. lepcsohaz, mfszt. Szeminariumi szoba

        Ideje: 2006. december 15. pentek, 10:15.


        Minden erdeklodot szivesen latunk.



                                                                              
  Varga Imre