2011/12/31 by Niladri Sarkar, Abhik Basu
Physics and Astronomy · #cond-mat.stat-mech
paper · pdf · doi:10.1103/physreve.85.021113
published as Phys. Rev. E. 85, 021113 (2012) · 26 pages in preprint format, 3 eps figures, textual modification has been done, this version has appeared in PRE. arXiv admin note: text overlap with arXiv:cond-mat/9807207 by other authors
arxiv created 2012/02/13 · arxiv updated 2012/02/14
We elucidate a non-conserved relaxational nonequilibrium dynamics of a O(2) symmetric model. We drive the system out of equilibrium by introducing a non-zero noise cross-correlation of amplitude D_× in a stochastic Langevin description of the system, while maintaining the O(2) symmetry of the order parameter space. By performing dynamic renormalization group calculations in a field-theoretic set up, we analyze the ensuing nonequilibrium steady states and evaluate the scaling exponents near the critical point, which now depend explicitly on D_×. Since the latter remains unrenormalized, we obtain universality classes varying continuously with D_×. More interestingly, by changing D_× continuously from zero, we can make our system move away from its equilibrium behavior (i.e., when D_×=0) continuously and incrementally.