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Exodus: Hidden origin of dark matter and baryons

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Abstract

We propose a new framework for explaining the proximity of the baryon and dark matter relic densities ΩDM ≈ 5Ω B . The scenario assumes that the number density of the observed dark matter states is generated due to decays from a second hidden sector which simultaneously generates the baryon asymmetry. In contrast to asymmetric dark matter models, the dark matter can be a real scalar or Majorana fermion and thus presents distinct phenomenology. We discuss aspects of model building and general constraints in this framework. Moreover, we argue that this scenario circumvents several of the experimental bounds which significantly constrain typical models of asymmetric dark matter. We present a simple supersymmetric implementation of this mechanism and show that it can be used to obtain the correct dark matter relic density for a bino LSP.

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Authors and Affiliations

  1. Rudolf Peierls Centre for Theoretical Physics, University of Oxford, 1 Keble Road, Oxford, OX1 3NP, U.K.

    James Unwin

  2. Mathematical Institute, University of Oxford, 24-29 St Giles, Oxford, OX1 3LB, U.K.

    James Unwin

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  1. James Unwin
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ArXiv ePrint: 1212.1425

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Unwin, J. Exodus: Hidden origin of dark matter and baryons. J. High Energ. Phys. 2013, 90 (2013). https://doi.org/10.1007/JHEP06(2013)090

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