Nonequilibrium perturbation theory for complex scalar fields

Details Nonequilibrium perturbation theory for complex scalar fields Nonequilibrium perturbation theory for complex scalar fields

1996-10-23

arxiv.org/abs/hep-th/9610175v1

Phys.Rev. D55 (1997) 2290-2297

Physics

High Energy Physics

High Energy Physics - Theory

15 pages using RevTeX; 2 figures in 1 Postscript file; Submitted to Phys. Rev. D

Scientific paper

10.1103/PhysRevD.55.2290

Real-time perturbation theory is formulated for complex scalar fields away from thermal equilibrium in such a way that dissipative effects arising from the absorptive parts of loop diagrams are approximately resummed into the unperturbed propagators. Low order calculations of physical quantities then involve quasiparticle occupation numbers which evolve with the changing state of the field system, in contrast to standard perturbation theory, where these occupation numbers are frozen at their initial values. The evolution equation of the occupation numbers can be cast approximately in the form of a Boltzmann equation. Particular attention is given to the effects of a non-zero chemical potential, and it is found that the thermal masses and decay widths of quasiparticle modes are different for particles and antiparticles.

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