Hermano Velten, Etienne Wamba
We assume that dark matter is composed of scalar particles that form a
Bose-Einstein condensate (BEC) at some point during the cosmic evolution.
Afterwards, cold dark matter is in the form of a condensate and behaves
slightly different from the standard dark matter component. We study the large
scale perturbative dynamics of the BEC dark matter in a model where this
component coexists with baryonic matter and cosmological constant. The
perturbative dynamics is studied using neo- Newtonian cosmology (where the
pressure is dynamically relevant for the homogeneous and isotropic background)
which is assumed to be correct for small values of the sound speed. We show
that BEC dark matter effects can be seen in the matter power spectrum if the
mass of the condensate particle lies in the range 15meV < m < 700meV leading to
a small, but perceptible, excess of power at large scales.
View original:
http://arxiv.org/abs/1111.2032
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