title: Continuous universality in nonequilibrium relaxational dynamics of O2 symmetric systems.
abstract: We elucidate a nonconserved relaxational nonequilibrium dynamics of a O(2) symmetric model. We drive the system out of equilibrium by introducing a nonzero 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.
authors.affiliation: Theoretical Condensed Matter Physics Division, Saha Institute of Nuclear Physics, Calcutta 700064, India. niladri.sarkar@saha.ac.in
authors.forename: Niladri
authors.initials: N
authors.lastname: Sarkar
authors.forename: Abhik
authors.initials: A
authors.lastname: Basu
mesh_terms: D003198:Computer Simulation; D008956:Models, Chemical; D008958:Models, Molecular; D010100:Oxygen / Q000737:chemistry*; D013269:Stochastic Processes; D013816:Thermodynamics
chemical_list: D010100:Oxygen