ELFT HÍRADÓ

[Zoltan Mate <mate AT namafia.atomki.hu>]

Az MTA Atommagkutató Intézetének nagy előadójában
(Debrecen, Bem tér 18/c. 12. ép. III. em.)
2006. október 25-én, SZERDÁN 11:00-kor


                  Nobuyasu ITO
            (The University of Tokyo)

         Nonequilibrium relaxation analysis
             on phase and transition


címmel előadást tart.
Az előadás előtt 10:30-tól tea.
Vendégeket szívesen látunk.


                                   Máté Zoltán

Abstract:
Well-established simulation method to study the thermal phases and 
transitions is the so-called equilibrium method, in which one firstly 
realizes the equilibrium ensemble of a finite system and then extrapolates 
the results to infinite system. This equilibrium strategy traces over the 
standard theory of the thermal statistical mechanics, and the idea of the 
thermodynamic limit. Recently, alternative simulation strategy was 
proposed. It analyzes the nonequilibrium relaxation (NER) process and it 
is called the NER method. There are some advantages in the NER method. 
First of all, it provides simpler analyzing procedure. This implies the 
less systematic error which is inevitable in the simulation and provides 
efficient resource usage. Furthermore, the NER method easily treats not 
only the thermodynamic limit but also other limits: for example, 
finite-time behavior of infinite system. So the NER method cultivates the 
new fields of the statistical physics. Application of the NER method has 
been expanding to various problems: from basic first- and second-order 
transitions to advanced and exotic phases like chiral, KT spin-glass and 
quantum phases. From these studies, not only the improvements in accuracy 
like better estimations of transition point and exponents, but also 
qualitative developments have been provided. For example, the universality 
class of random system, the nature of the two-dimensional melting and the 
scaling behavior of the spin-glass aging phenomena have been shown. 
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