From quantum to classical dynamics: The relativistic O ( N ) model in the framework of the real-time functional renormalization group

Mesterhazy, David; Stockemer, J. H.; Tanizaki, Y. (2015). From quantum to classical dynamics: The relativistic O ( N ) model in the framework of the real-time functional renormalization group. Physical review. D - particles, fields, gravitation, and cosmology, 92(7), 076001. American Physical Society 10.1103/PhysRevD.92.076001

Preview	Text 1504.07268.pdf - Submitted Version Available under License Publisher holds Copyright. Download (1MB) | Preview
	Text PhysRevD.92.pdf - Published Version Restricted to registered users only Available under License Publisher holds Copyright. Download (1MB)

We investigate the transition from unitary to dissipative dynamics in the relativistic O(N) vector model with the λ(φ2)2 interaction using the nonperturbative functional renormalization group in the real-time formalism. In thermal equilibrium, the theory is characterized by two scales, the interaction range for coherent scattering of particles and the mean free path determined by the rate of incoherent collisions with excitations in the thermal medium. Their competition determines the renormalization group flow and the effective dynamics of the model. Here we quantify the dynamic properties of the model in terms of the scale-dependent dynamic critical exponent z in the limit of large temperatures and in 2≤d≤4 spatial dimensions. We contrast our results to the behavior expected at vanishing temperature and address the question of the appropriate dynamic universality class for the given microscopic theory.

Interest & Impact

Downloads

236 since deposited on 16 Feb 2016
26 in the past 12 months

Citations

5 Citations in Web of Science ®
6 Citations in Scopus

Search

in Google Scholar™

Services

Actions (login required)

Edit item

Actions (login required)

Edit item