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DY: Dynamik und Statistische Physik

DY 34: Poster

DY 34.118: Poster

Montag, 7. März 2005, 15:30–18:00, Poster TU D

Critical dynamics of a stochastic model with two conserved densities — •Reinhard Folk¹ and Günter Moser² — ¹Institute for Theoretical Physics, University of Linz, Austria — ²Institute for Physics and Biophysics, University of Salzburg, Austria

We calculate the field theoretic functions of the generalized dynamical model C*’, where two conserved secondary densities are coupled to a nonconserved complex order parameter (OP), in two-loop order. A transformation to ’orthogonalized’ densities can be performed where only one secondary density with nontrivial static coupling to the OP exists while the second one remains Gaussian. The secondary densities remain dynamically coupled by the nondiagonal diffusion coefficent.

General relations for the field theoretic functions allow to relate the asymptotic critical properties of model C*’ to the simpler model C* with only one conserved density coupled to the OP, the nonasymptotic properties however differ as can be seen from the flow of the dynamic parameters, which is presented for the case of a real OP with componets n=1,2,3.