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

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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.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)
08 Faculty of Science > Institute of Theoretical Physics

UniBE Contributor:

Mesterhazy, David

Subjects:

500 Science > 530 Physics

ISSN:

1550-7998

Publisher:

American Physical Society

Language:

English

Submitter:

Esther Fiechter

Date Deposited:

16 Feb 2016 16:46

Last Modified:

19 Feb 2016 00:54

Publisher DOI:

10.1103/PhysRevD.92.076001

ArXiv ID:

1504.07268v3

BORIS DOI:

10.7892/boris.75472

URI:

https://boris.unibe.ch/id/eprint/75472

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