Natural $X$-ray Lines from the Low Scale Supersymmetry Breaking

Zhaofeng Kang; P. Ko; Tianjun Li; Yandong Liu

doi:10.1016/j.physletb.2015.01.040

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arXiv · 1403.7742

Natural $X$-ray Lines from the Low Scale Supersymmetry Breaking

Zhaofeng Kang·P. Ko·Tianjun Li·Yandong Liu

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Abstract

In the supersymmetric models with low scale supersymmetry (SUSY) breaking where the gravitino mass is around keV, we show that the 3.5 keV $X-$ray lines can be explained naturally through several different mechanisms: (I) A keV scale dark gaugino plays the role of sterile neutrino in the presence of bilinear $R-$partiy violation. Because the light dark gaugino obtains Majorana mass only via gravity mediation, it is a decaying warm dark matter (DM) candidate; (II) Compressed cold DM states, whose mass degeneracy is broken by gavity mediated SUSY breaking, emit such a line via the heavier one decay into the lighter one plus photon(s). A highly supersymmetric dark sector may readily provide such kind of system; (III) Light axino, whose mass again is around the gravitino mass, decays to neutrino plus gamma in the $R-$partiy violating SUSY. Moreover, we comment on dark radiation from dark gaugino.

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Zhaofeng Kang, P. Ko, Tianjun Li, Yandong Liu. 2015-02-07. Natural $X$-ray Lines from the Low Scale Supersymmetry Breaking. https://doi.org/10.1016/j.physletb.2015.01.040

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