Cosmological Two-stream Instability

Details Cosmological Two-stream Instability Cosmological Two-stream Instability

2011-11-23

arxiv.org/abs/1111.5607v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

4 pages, 3 figures

Scientific paper

Two-stream instability requires, essentially, two things to operate: a relative flow between two fluids and some type of interaction between them. In this letter we provide the first demonstration that this mechanism may be active in a cosmological context. Building on a recently developed formalism for cosmological models with two, interpenetrating fluids (considering as an example "dust" and radiation) with a relative flow between them, we show that two-stream instability may be triggered during the radiation-to-matter transition. We also demonstrate that the cosmological expansion eventually shuts down the instability by driving to zero the relative flow and the coupling between the two fluids.

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