The effect of early dark matter halos on reionization

Details The effect of early dark matter halos on reionization The effect of early dark matter halos on reionization

2008-05-26

arxiv.org/abs/0805.3945v3

Phys.Rev.D78:103524,2008; Erratum-ibid.D81:089905,2010

Astronomy and Astrophysics

Astrophysics

Minor changes from v2. Accepted for publication in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.78.103524

The annihilation of dark matter particles releases energy, ionizing some of the gas in the Universe. We investigate the effect of dark matter halos on reionization. We show that the effect depends on the assumed density profile, the particle mass, and the assumed minimum halo mass. For NFW halos and typical WIMPs, we find the effect to be quite small. However, light dark matter candidates in the MeV range can contribute significantly to reionization and can make an important contribution to the measured optical depth. This effect may be used to constrain light dark matter models. We also study the effect of varying the halo density profile on reionization.

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