Effects of weak self-interactions in a relativistic plasma on cosmological perturbations

Details Effects of weak self-interactions in a relativistic plasma on cosmological perturbations Effects of weak self-interactions in a relativistic plasma on cosmological perturbations

1994-09-27

arxiv.org/abs/gr-qc/9409055v2

Phys.Rev.D51:2504-2508,1995

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

11 pages, REVTEX, 4 postscript figures included by epsf.sty - expanded version (more details on the resummation of thermal mas

Scientific paper

10.1103/PhysRevD.51.2504

The exact solutions for linear cosmological perturbations which have been obtained for collisionless relativistic matter within thermal field theory are extended to a self-interacting case. The two-loop contributions of scalar $\lambda\phi^4$ theory to the thermal graviton self-energy are evaluated, which give the $O(\lambda)$ corrections in the perturbation equations. The changes are found to be perturbative on scales comparable to or larger than the Hubble horizon, but the determination of the large-time damping behavior of subhorizon perturbations requires a resummation of thermally induced masses.

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