Hardy, Edward 
ORCID: 0000-0003-3263-6575
(2018)
Higgs portal dark matter in non-standard cosmological histories.
JOURNAL OF HIGH ENERGY PHYSICS, 2018 (6).
43-.
Abstract
<jats:title>A<jats:sc>bstract</jats:sc> </jats:title> <jats:p>A scalar particle with a relic density set by annihilations through a Higgs portal operator is a simple and minimal possibility for dark matter. However, assuming a thermal cosmological history this model is ruled out over most of parameter space by collider and direct detection constraints. We show that in theories with a non-thermal cosmological history Higgs portal dark matter is viable for a wide range of dark matter masses and values of the portal coupling, evading existing limits. In particular, we focus on the string theory motivated scenario of a period of matter domination due to a light modulus with a decay rate that is suppressed by the Planck scale. Dark matter with a mass ≲ GeV is possible without additional hidden sector states, and this can have astrophysically relevant self-interactions. We also study the signatures of such models at future direct, indirect, and collider experiments. Searches for invisible Higgs decays at the high luminosity LHC or an <jats:italic>e</jats:italic> <jats:sup>+</jats:sup> <jats:italic>e</jats:italic> <jats:sup>−</jats:sup> collider could cover a significant proportion of the parameter space for low mass dark matter, and future direct detection experiments will play a complementary role.</jats:p>
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Cosmology of Theories beyond the SM, Higgs Physics |
| Depositing User: | Symplectic Admin |
| Date Deposited: | 19 Jun 2018 06:25 |
| Last Modified: | 15 Mar 2024 13:35 |
| DOI: | 10.1007/JHEP06(2018)043 |
| Open Access URL: | https://link.springer.com/article/10.1007/JHEP06(2... |
| Related URLs: | |
| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3022743 |
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