Cosmological Perturbations of Ultrarelativistic Plasmas

Details Cosmological Perturbations of Ultrarelativistic Plasmas Cosmological Perturbations of Ultrarelativistic Plasmas

1996-07-31

arxiv.org/abs/gr-qc/9607077v1

Helv.Phys.Acta 69:194-197,1996

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

talk given at Journees Relativistes '96 (Ascona, Switzerland), 4 pages, LaTeX, two Postscript figures

Scientific paper

Scalar cosmological perturbations of a weakly self-interacting plasma mixed with a perfect radiation fluid are investigated. Effects of this plasma are considered through order $\lambda^{3/2}$ of perturbative thermal-field-theory in the radiation dominated universe. The breakdown of thermal perturbation theory at vastly subhorizon scales is circumvented by a Pad\'e approximant solution. Compared to collisionless plasmas the phase speed and subhorizon damping of the plasma density perturbations are changed. An example for a self-interacting thermal field is provided by the neutrinos with effective 4-fermion interactions.

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