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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 hiddenglueballs with mass near the confinement scale $\Lambda$. For $m_X \sim1\,\text{TeV}$ and $\Lambda \sim 100\,\text{MeV}$, the glueballinos freeze outwith the correct relic density and self-interact through glueball exchange toresolve small-scale structure puzzles. An immediate consequence is that theglueballino spectrum has a hyperfine splitting of order $\Lambda^2 / m_X \sim10\,\text{keV}$. We show that the radiative decays of the excited state canexplain the observed 3.5 keV X-ray line signal from clusters of galaxies,Andromeda, and the Milky Way.

SIMPle Dark Matter: Self-Interactions and keV Lines