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Decaying vector dark matter as an explanation for the 3.5 keV line from galaxy clusters

Farzan, Y ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1088/1475-7516/2014/11/015
  3. Abstract:
  4. 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, gV. V' is slightly heavier than V with a mass splitting mV' - mV 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 mV' < T < Λ, Λ being the cut-off above which the effective gV coupling is not valid. We introduce a high energy model that gives rise to the gV 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 gV coupling at low energy via triangle diagrams
  5. Keywords:
  6. Dark matter theory ; Particle physics - cosmology connection ; X-ray telescopes
  7. Source: Journal of Cosmology and Astroparticle Physics ; Vol. 2014, issue. 11 , 2014 ; ISSN: 14757516
  8. URL: http://iopscience.iop.org/1475-7516/2014/11/015