Thermally Generated Gauge Singlet Scalars as Self-Interacting Dark Matter

2001/06/30 by John McDonald · 1 citation
Physics and Astronomy · #astro-ph #hep-ph

paper · pdf · doi:10.1103/physrevlett.88.091304

published as Phys.Rev.Lett. 88 (2002) 091304 · 11 pages LaTeX; considerably shortened and evolved final version, to be published in Phys.Rev.Lett

arxiv created 2002/01/20 · arxiv updated 2009/11/30

Abstract

We show that a gauge singlet scalar S, with a coupling to the Higgs doublet of the form lambda_S S^†S H^†H and with the S mass entirely generated by the Higgs expectation value, has a thermally generated relic density Omega_S ≈ 0.3 if m_S ≈ (2.9-10.5)(Omega_S/0.3)^1/5(h/0.7)^2/5 MeV for Higgs boson masses in the range 115 GeV to 1 TeV. Remarkably, this is very similar to the range (m_S = (6.6-15.4)η^2/3 MeV) required in order for the self-interaction (η/4)(S^†S)² to account for self-interacting dark matter when ηis not much smaller than 1. The corresponding coupling is lambda_S ≈ (2.7 × 10^-10 - 3.6 × 10^-9)(Omega_S/0.3)^2/5(h/0.7)^4/5, implying that such scalars are very weakly coupled to the Standard Model sector.

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