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arXiv · 1502.07198

Mixed axion-wino dark matter

Kyu Jung Bae·Howard Baer·Andre Lessa·Hasan Serce
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Abstract

A variety of supersymmetric models give rise to a split mass spectrum characterized by very heavy scalars but sub-TeV gauginos, usually with a wino-like LSP. Such models predict a thermally-produced underabundance of wino-like WIMP dark matter so that non-thermal DM production mechanisms are necessary. We examine the case where theories with a wino-like LSP are augmented by a Peccei-Quinn sector including an axion-axino-saxion supermultiplet in either the SUSY KSVZ or SUSY DFSZ models and with/without saxion decays to axions/axinos. We show allowed ranges of PQ breaking scale f_a for various cases which are generated by solving the necessary coupled Boltzmann equations. We also present results for a model with radiatively-driven naturalness but with a wino-like LSP.

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Kyu Jung Bae, Howard Baer, Andre Lessa, Hasan Serce. 2015-02-25. Mixed axion-wino dark matter. https://arxiv.org/abs/1502.07198

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