Strong Dissipative Behavior in Quantum Field Theory

Details Strong Dissipative Behavior in Quantum Field Theory Strong Dissipative Behavior in Quantum Field Theory

1998-03-19

arxiv.org/abs/hep-ph/9803394v4

Phys.Rev.D58:123508,1998

Physics

High Energy Physics

High Energy Physics - Phenomenology

45 pages, 5 figures, Latex, In press Phys. Rev. D, minor corrections

Scientific paper

10.1103/PhysRevD.58.123508

We study under which conditions an overdamped regime can be attained in the dynamic evolution of a quantum field configuration. Using a real-time formulation of finite temperature field theory, we compute the effective evolution equation of a scalar field configuration, quadratically interacting with a given set of other scalar fields. We then show that, in the overdamped regime, the dissipative kernel in the field equation of motion is closely related to the shear viscosity coefficient, as computed in scalar field theory at finite temperature. The effective dynamics is equivalent to a time-dependent Ginzburg-Landau description of the approach to equilibrium in phenomenological theories of phase transitions. Applications of our results, including a recently proposed inflationary scenario called ``warm inflation'', are discussed.

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