Perturbation theory for nonequilibrium quantum fields

Details Perturbation theory for nonequilibrium quantum fields Perturbation theory for nonequilibrium quantum fields

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993cajph..71..262l&link_type=abstract

Canadian Journal of Physics (ISSN 0008-4204), vol. 71, no. 5-6, p. 262-268

Physics

3

Correction, Formalism, Perturbation Theory, Quantum Theory, Real Time Operation, Universe, Mathematical Models, Relativity, Thermodynamics

Scientific paper

Standard perturbation theory fails when applied to nonequilibrium processes. The author explains why. To achieve sensible results, it is necessary to resum the absorptive parts of real-time self-energy corrections. Using the closed-time-path formalism, and in the context of scalar-field theory in an expanding universe, the author shows how a generalized renormalization technique can achieve this.

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