G. L. Comer, Patrick Peter, N. Andersson
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.
View original:
http://arxiv.org/abs/1111.5607
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