Mixed dark matter with low-mass bosons

Details Mixed dark matter with low-mass bosons Mixed dark matter with low-mass bosons

1996-01-24

arxiv.org/abs/astro-ph/9601134v1

Phys.Rev.D53:2895-2900,1996

Astronomy and Astrophysics

Astrophysics

17 pages+4 postscript figures, to appear in Phys. Rev. D15 March

Scientific paper

10.1103/PhysRevD.53.2895

We calculate the linear power spectrum for a range of mixed dark matter (MDM) models assuming a massive (few eV) boson, $\phi$, instead of a neutrino as the hot component. We consider both the case where the hot dark matter (HDM) particle is a boson and the cold component is some other unknown particle, and the case where there is only one dark matter particle, a boson, with the cold dark matter (CDM) component in a Bose condensate. Models resembling the latter type could arise from neutrino decays - we discuss some variants of this idea. The power spectra for MDM models with massive bosons are almost identical to neutrino MDM models for a given mass fraction of HDM if the bosons are distinct from their antiparticles ($\phi\neq\bar\phi$) and have a temperature like that of neutrinos, whereas models with $\phi=\bar\phi$ tend to overproduce small-scale structure.

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