Nonequilibrium dynamics: A renormalized computation scheme

Journal Article · Sat Feb 01 04:00:00 EST 1997 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.55.2320· OSTI ID:467488

Baacke, J; Heitmann, K; Paetzold, C ^[1]

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1. Institut fuer Physik, Universitaet Dortmund, D-44221 Dortmund (Germany)

We present a regularized and renormalized version of the one-loop nonlinear relaxation equations that determine the nonequilibrium time evolution of a classical (constant) field coupled to its quantum fluctuations. We obtain a computational method in which the evaluation of divergent fluctuation integrals and the evaluation of the exact finite parts are cleanly separated so as to allow for a wide freedom in the choice of regularization and renormalization schemes. We use dimensional regularization here. Within the same formalism we analyze also the regularization and renormalization of the energy-momentum tensor. The energy density serves to monitor the reliability of our numerical computation. The method is applied to the simple case of a scalar {phi}{sup 4} theory; the results are similar to the ones found previously by other groups. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 467488
• Journal Information: Physical Review, D, Journal Name: Physical Review, D Journal Issue: 4 Vol. 55; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ENERGY DENSITY
ENERGY-MOMENTUM TENSOR
FLUCTUATIONS
PERTURBATION THEORY
PHASE TRANSFORMATIONS
PHI4-FIELD THEORY
RELAXATION
RENORMALIZATION
THERMAL EQUILIBRIUM