Ultra light bosonic dark matter and cosmic microwave background
arXiv:0908.0054 · doi:10.1088/0004-637X/721/2/1509
Abstract
In this paper, we consider the hypothesis in which a species of ultra light bosonic dark matter (ULBDM) with mass eV could be the dominant dark matter (DM) in the Universe. As a first approach we work in the context of kinetic theory, where ULBDM is described by the phase space distribution function whose dynamics is dictated by the Boltzmann-Einstein equations. We investigate the effects that this kind of dark matter imprints in the acoustic peaks of the cosmic microwave background. We find that the effect of the Bose-Einstein statistics is small, albeit perceptible, and is equivalent to an increase of non-relativistic matter. It is stressed that in this approach, the mass-to-temperature ratio necessary for ULBDM to be a plausible DM candidate is about five orders of magnitude. We show that reionization is also necessary and we address a range of consistent values for this model. We find that the temperature of ULBDM is below the critical value, impliying that Bose-Einstein condensation is inherent to the ULBDM paradigm.
6 pages, 5 figures, two authors added, improved, extended in section 2, more discussions to clarify some issues, references added, typos corrected, published version in ApJ
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