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arXiv · 1403.6621

Axino dark matter in light of an anomalous X-ray line

Seng Pei Liew
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Abstract

Axino as the superpartner of axion that solves the strong CP problem can be a good candidate of dark matter. Inspired by the 3.5 keV X-ray line signal found to be originated from galaxy clusters and Andromeda galaxy, we study axino models with R-parity violations, and point out that axino dark matter with trilinear R-parity violations is an attractive scenario that reproduces the X-ray line. The Peccei-Quinn scale is required to be $f_a \sim{\cal O}(10^{9}-10^{11})$ GeV for trilinear R-parity violating couplings $λ\sim {\cal O} (10^{-3}-10^{-1})$ in order to explain the line signal. Moreover, the right-handed stau is predicted to be light, i.e. $\sim{\cal O}(100)$ GeV, and thus can be looked for at the LHC. Cosmological aspects of the model are also discussed in this study.

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Seng Pei Liew. 2014-05-30. Axino dark matter in light of an anomalous X-ray line. https://doi.org/10.1088/1475-7516%2F2014%2F05%2F044

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