Dark Matter and the Baryon Asymmetry of the Universe

Details Dark Matter and the Baryon Asymmetry of the Universe Dark Matter and the Baryon Asymmetry of the Universe

2004-06-24

arxiv.org/abs/hep-ph/0406281v3

Phys.Rev.Lett. 96 (2006) 041302

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pp. Added references and corrected typos

Scientific paper

We present a mechanism to generate the baryon asymmetry of the Universe which preserves the net baryon number created in the Big Bang. If dark matter particles carry baryon number $B_X$, and $\sigma^{\rm annih}_{\bar{X}} < \sigma^{\rm annih}_{X} $, the $\bar{X}$'s freeze out at a higher temperature and have a larger relic density than $X$'s. If $m_X \lsi 4.5 B_X $GeV and the annihilation cross sections differ by $\gsi 10%$, this type of scenario naturally explains the observed $\Omega_{DM} \approx 5 \Omega_b$.

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