The dynamics of cosmological perturbations in thermal $λφ^4$ theory

Details The dynamics of cosmological perturbations in thermal $λφ^4$ theory The dynamics of cosmological perturbations in thermal $λφ^4$ theory

1995-10-23

arxiv.org/abs/gr-qc/9510046v1

Phys.Rev. D53 (1996) 5468-5482

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

32 pages, REVTEX, 13 postscript figures included by epsf.sty

Scientific paper

10.1103/PhysRevD.53.5468

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 $\lambda\phi^4$ model through order $\lambda^{3/2}$. 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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