Asymptotic dynamics of thermal quantum fields

Abstract

It is shown that the timelike asymptotic properties of thermal correlation functions in relativistic quantum field theory can consistently be described in terms of free fields carrying some stochastic degree of freedom which couples to the thermal background. These ``asymptotic thermal fields'' have specific algebraic properties (commutation relations) and their dynamics can be expressed in terms of asymptotic field equations. The formalism is applied to interacting theories where it yields concrete non-perturbative results for the asymptotic thermal propagators. The results are consistent with the expected features of dissipative propagation of the constitutents of thermal states, outlined in previous work, and they shed new light on the non-perturbative effects of thermal backgrounds.

23 pages, 2 figures; introduction extended, appendix on thermal Green's functions added. Version as to appear in Nuclear Physics B

References in corpus (4)

• Towards a Relativistic KMS Condition
• Effective theories for real-time correlations in hot plasmas
• The Bloch-Nordsieck propagator at finite temperature
• Temperature Independent Renormalization of Finite Temperature Field Theory

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