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2011년 2월 9일 (수) 09:18 판

introduction

The simple exclusion process is a model of a lattice gas with an exclusion principle: a particle can move to a neighboring site, with rate p  for each side, only if this is empty.

exclusion rule which forbids to have more than one particle per site

Bethe Ansatz and Exclusion Processes http://events.berkeley.edu/index.php/calendar/sn/math.html?event_ID=39328&date=2011-02-01

symmetric exclusion process

particles jumping from left ro right or from right ro left with given probabilityes p and q (p+q=1)

G(x,t) = probability (x(t)=x | x(0) is distrbuted according to g(x) )

 

 

 

KPZ equation

Stochastic growth models in the plane

For simple case, consider a graph of a random height function h.

Consider the rescaling

h^{\epsion}(x,t)=\epsilon h(\frac{x}{\epsilon},\frac{t}{\epsilon})

Then we expect to have

 

 

After some scaling argument, one may use KPZ equation to justify \epsilon^{2/3} as the order og the fluctuations of the above problem. But what is the law of the random \eta ?

Perhaps we can locate an example for which we can find exact formula for h as a result a formula for \eta. So for we have two examples that are "exactly solvable"

These examples are

Hammersley-Aldous-Diaconis (HAD) process and simple exclusion processes.

For the latter a trick known on Bethe ansatz is used to find very explicit formulas for various quantities of interest.

 

 

Bethe ansatz

 

history

 

 

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encyclopedia

 

 

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expositions
  • Golinelli, Olivier, and Kirone Mallick. 2006. The asymmetric simple exclusion process: an integrable model for non-equilibrium statistical mechanics. Journal of Physics A: Mathematical and General 39, no. 41 (10): 12679-12705. doi:10.1088/0305-4470/39/41/S03

 

 

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