Exploring Inflation Options for Warm Dark Matter Coupled to the Higgs Boson

Abstract

We extend the Standard Model with a scalar warm dark matter field S with an interaction ( ) † 2 1 2 hS S λ φ φ − with the Higgs boson φ . This warm dark matter scenario is in agreement with cosmological observations if S and φ come into thermal and diffusive equilibrium before the temperature drops below the Higgs boson mass m H . We study inflation driven by the fields φor S , and also study preheating and reheating, in order to constrain the parameters of this extension of the Standard Model. It is remarkable that, with the current data, these models pass a closure test with no free parameters.

Understanding the Formation of Galaxies with Warm Dark Matter

“…galaxy stellar mass distributions, galaxy rest-frame ultra-violet luminosity distributions, first galaxies, and their effect on the reionization optical depth [17]. All of these measurements of ( ) rms 1 h v are consistent, solve the small scale problems of ΛCDM [18], and constrain the warm dark matter particle properties [9] [11] [19].…”