Abstract
A new scheme for lightest supersymmetric particle (LSP) dark matter is introduced and studied in theories of TeV supersymmetry with a QCD axion, a, and a high reheat temperature after inflation, T R . A large overproduction of axinos (ã) and gravitinos \( \left(\tilde{G}\right) \) from scattering at T R , and from freeze-in at the TeV scale, is diluted by the late decay of a saxion condensate that arises from inflation. The two lightest superpartners are ã, with mass of order the TeV scale, and \( \tilde{G} \) with mass m 3/2 anywhere between the keV and TeV scales, depending on the mediation scale of supersymmetry breaking. Dark matter contains both warm and cold components: for \( \tilde{G} \) LSP the warm component arises from \( \tilde{a}\to \tilde{G}a \), while for ã LSP the warm component arises from \( \tilde{G}\to \tilde{a}a \). The free-streaming scale for the warm component is predicted to be of order 1 Mpc (and independent of m 3/2 in the case of \( \tilde{G} \) LSP). T R can be as high as 1016 GeV, for any value of m 3/2, solving the gravitino problem. The PQ symmetry breaking scale V PQ depends on T R and m 3/2 and can be anywhere in the range (1010 − 1016) GeV. Detailed predictions are made for the lifetime of the neutralino LOSP decaying to ã+h/Z and \( \tilde{G}+h/Z/\gamma \), which is in the range of (10−1 −106)m over much of parameter space. For an axion misalignment angle of order unity, the axion contribution to dark matter is sub-dominant, except when V PQ approaches 1016 GeV.
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Co, R.T., D’Eramo, F. & Hall, L.J. Gravitino or axino dark matter with reheat temperature as high as 1016 GeV. J. High Energ. Phys. 2017, 5 (2017). https://doi.org/10.1007/JHEP03(2017)005
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DOI: https://doi.org/10.1007/JHEP03(2017)005