Bulk viscosity of a gas of neutrinos and coupled scalar particles, in the era of recombination

Details Bulk viscosity of a gas of neutrinos and coupled scalar particles, in the era of recombination Bulk viscosity of a gas of neutrinos and coupled scalar particles, in the era of recombination

2006-01-23

arxiv.org/abs/astro-ph/0601525v1

Phys.Rev. D74 (2006) 043527

Astronomy and Astrophysics

Astrophysics

6 pages, 4 figures

Scientific paper

10.1103/PhysRevD.74.043527

Bulk viscosity may serve to damp sound waves in a system of neutrinos coupled
to very light scalar particles, in the era after normal neutrino decoupling but
before recombination. We calculate the bulk viscosity parameter in a minimal
scheme involving the coupling of the two systems. We add some remarks on the
bulk viscosity of a system of fully ionized hydrogen plus photons.

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