Dynamics of cosmological perturbations in thermal λφ4 theory.

Details Dynamics of cosmological perturbations in thermal λφ4 theory. Dynamics of cosmological perturbations in thermal λφ4 theory.

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995dcpt.book.....n&link_type=abstract

Dynamics of cosmological perturbations in thermal λφ4 theory., by Nachbagauer, H.; Rebhan, A. K.; Schwarz, D. J.. DESY, Hamburg

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Using a recent thermal-field-theory approach to cosmological perturbations, the exact solutions that were found for collisionless ultrarelativistic matter are generalized to include the effects from weak self-interactions in a λφ4 model through order λ3/2. This includes the effects of a resummation of thermal masses and associated nonlocal gravitational vertices, thus going far beyond classical kinetic theory. Explicit solutions for all the scalar, vector, and tensor modes are obtained for a radiation-dominated Einstein-de Sitter model containing a weakly interacting scalar plasma with or without the admixture of an independent component of perfect radiation fluid.

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