期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 11, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2014/11/015
关键词
dark matter theory; X-ray telescopes; particle physics - cosmology connection
资金
- European Union FP7 ITN INVISIBLES (Marie Curie Actions) [PITN-GA-2011-289442]
We present a Vector Dark Matter (VDM) model that explains the 3.5 keV line recently observed in the XMM-Newton observatory data from galaxy clusters. In this model, dark matter is composed of two vector bosons, V and V', which couple to the photon through an effective generalized Chern-Simons coupling, g(V). V' is slightly heavier than V with a mass splitting m(V') - m(V) similar or equal to 3.5 keV. The decay of V' to V and a photon gives rise to the 3.5 keV line. The production of V and V' takes place in the early universe within the freeze-in framework through the effective gv coupling when m(V') < T < Lambda, Lambda being the cut-off above which the effective g(V) coupling is not valid. We introduce a high energy model that gives rise to the g(V) coupling at low energies. To do this, V and V' are promoted to gauge bosons of spontaneously broken new U(1)(V) and U(1)(V') gauge symmetries, respectively. The high energy sector includes milli-charged chiral fermions that lead to the g(V) coupling at low energy via triangle diagrams.
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