Dark Matter Assimilation into the Baryon Asymmetry

Details Dark Matter Assimilation into the Baryon Asymmetry Dark Matter Assimilation into the Baryon Asymmetry

2011-11-23

arxiv.org/abs/1111.5615v3

JCAP03(2012)010

Physics

High Energy Physics

High Energy Physics - Phenomenology

27 pages, 9 figures, 4 tables; v2, references added, switched to JCAP format; v3, references added, version published in JCAP

Scientific paper

10.1088/1475-7516/2012/03/010

Pure singlets are typically disfavored as dark matter candidates, since they generically have a thermal relic abundance larger than the observed value. In this paper, we propose a new dark matter mechanism called "assimilation", which takes advantage of the baryon asymmetry of the universe to generate the correct relic abundance of singlet dark matter. Through assimilation, dark matter itself is efficiently destroyed, but dark matter number is stored in new quasi-stable heavy states which carry the baryon asymmetry. The subsequent annihilation and late-time decay of these heavy states yields (symmetric) dark matter as well as (asymmetric) standard model baryons. We study in detail the case of pure bino dark matter by augmenting the minimal supersymmetric standard model with vector-like chiral multiplets. In the parameter range where this mechanism is effective, the LHC can discover long-lived charged particles which were responsible for assimilating dark matter.

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