Warm dark matter in a BL inverse seesaw scenario

Amr El-Zant, Shaaban Khalil, and Arunansu Sil
Phys. Rev. D 91, 035030 – Published 27 February 2015

Abstract

We show that a standard model gauge singlet fermion field, with mass of order keV or larger, and involved in the inverse seesaw mechanism of light neutrino mass generation, can be a good warm dark matter candidate. Our framework is based on BL extension of the standard model. The construction ensures the absence of any mixing between active neutrinos and the aforementioned dark matter field. This circumvents the usual constraints on the mass of warm dark matter imposed by x-ray observations. We show that an overabundance of thermally produced warm dark matter (which nevertheless does not reach chemical equilibrium) can be reduced to an acceptable range in the presence of a moduli field decaying into radiation—though only when the reheat temperature is low enough. Our warm dark matter candidate can also be produced directly from the decay of the moduli field during reheating. In this case, obtaining the right amount of relic abundance, while keeping the reheat temperature high enough as to be consistent with big bang nucleosynthesis bounds, places constraints on the branching ratio for the decay of the moduli field into dark matter.

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  • Received 31 August 2013

DOI:https://doi.org/10.1103/PhysRevD.91.035030

© 2015 American Physical Society

Authors & Affiliations

Amr El-Zant1,2, Shaaban Khalil1,3, and Arunansu Sil4

  • 1Center for Theoretical Physics, Zewail City for Science and Technology, 6 October City, Cairo 12588, Egypt
  • 2The British University in Egypt, Sherouk City, Cairo 11837, Egypt
  • 3Department of Mathematics, Faculty of Science, Ain Shams University, Cairo 11566, Egypt
  • 4Department of Physics, Indian Institute of Technology, Guwahati, Assam 781039, India

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Vol. 91, Iss. 3 — 1 February 2015

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