Cosmological Implications of Dark Matter Bound States [CL]

We present generic formulae for computing how Sommerfeld corrections together with bound-state formation affects the thermal abundance of Dark Matter with non-abelian gauge interactions. We consider DM as a fermion 3plet (wino) or 5plet under SU(2)$_L$. In the latter case bound states raise to 11.5 TeV the DM mass required to reproduce the cosmological DM abundance and give indirect detection signals such as (for this mass) a dominant $\gamma$-line around 70 GeV. Furthermore, we consider DM co-annihilating with a colored particle, such as a squark or a gluino, finding that bound state effects are especially relevant in the latter case.

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A. Mitridate, M. Redi, J. Smirnov, et. al.
Tue, 28 Feb 17

Comments: 40 pages, 11 figures. v2: ref.s added, typos corrected, discussion of indirect detection signals expanded