Analysis of a nonlinear stochastic model of cooperative behaviour |
| |
Authors: | M C Valsakumar |
| |
Institution: | (1) Materials Science Laboratory, Indira Gandhi Centre for Atomic Research, 603 102 Kalpakkam, India |
| |
Abstract: | A stochastic model of cooperative behaviour is analyzed with regard to its critical properties. A cumulant expansion to fourth
order is used to truncate the infinite set of coupled evolution equations for the moments. Linear stability analysis is performed
around all the permissible steady states. The method is shown to be incapable of reproducing the critical boundary and the
nature of the phase transition. A linearization, which respects the symmetry of the potential, is proposed which reproduces
all the basic features associated with the model. The dynamics predicted by this approximation is shown to agree well with
the Monte-Carlo simulation of the nonlinear Langevin equation. |
| |
Keywords: | Nonlinear Langevin equation phase transition critical exponent cumulant expansion Gaussian decoupling |
本文献已被 SpringerLink 等数据库收录! |