Dark matter in the Kim-Nilles mechanism

Abstract

The Kim-Nilles mechanism relates the $\mu$ term with the axion scale $f_a$, leading to the axino-Higgsino-Higgs Yukawa coupling of order $\mu /f_a$. This can bring a dangerous thermal production of axinos. If the axino is stable, its mass has to be as small as $\mathcal{O}$(0.1keV), or the reheat temperature should be lower than $\mathcal{O}$(10GeV) taking the lower axion scale $10^{10}$ GeV in order not to overclose the Universe. If the axino decays to a neutralino, the overproduced neutralinos can re-annihilate appropriately to saturate the observed dark matter density if the annihilation rate is of order $10^{-8}{GeV}^{-2}$ for the axion scale larger than about $10^{11}$ GeV. Thus, a light Higgsino-like lightest supersymmetric particle with a sizable bino mixture becomes a good dark matter candidate whose nucleonic cross-section is of order $10^{-45}$cm${}^2$.

10 pages, 1 figure; Corrected errors in Eq.(7) and in the direct detection cross-section of the Higgsino-like dark matter; Revised Fig.1; Added a discussion on the saxion; Added references; to appear in PRD

References in corpus (5)

• Mixed axion/neutralino cold dark matter in supersymmetric models
• Neutralino dark matter from heavy axino decay
• Cosmological implications of supersymmetric axion models
• Thermal leptogenesis and the gravitino problem in the Asaka-Yanagida axion/axino dark matter scenario
• The mu-problem and axion in gauge mediation

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