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arXiv · 1408.6532

SIMPle Dark Matter: Self-Interactions and keV Lines

Kimberly K. Boddy·Jonathan L. Feng·Manoj Kaplinghat·Yael Shadmi·Timothy M. P. Tait
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Abstract

We consider a simple supersymmetric hidden sector: pure SU(N) gauge theory. Dark matter is made up of hidden glueballinos with mass $m_X$ and hidden glueballs with mass near the confinement scale $Λ$. For $m_X \sim 1\,\text{TeV}$ and $Λ\sim 100\,\text{MeV}$, the glueballinos freeze out with the correct relic density and self-interact through glueball exchange to resolve small-scale structure puzzles. An immediate consequence is that the glueballino spectrum has a hyperfine splitting of order $Λ^2 / m_X \sim 10\,\text{keV}$. We show that the radiative decays of the excited state can explain the observed 3.5 keV X-ray line signal from clusters of galaxies, Andromeda, and the Milky Way.

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Kimberly K. Boddy, Jonathan L. Feng, Manoj Kaplinghat, Yael Shadmi, Timothy M. P. Tait. 2015-07-10. SIMPle Dark Matter: Self-Interactions and keV Lines. https://doi.org/10.1103/physrevd.90.095016

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