Scalar singlet dark matter in non-standard cosmologies

Autor:	Bernal, Nicolás, Cosme, Catarina, Tenkanen, Tommi, Vaskonen, Ville
Rok vydání:	2018
Předmět:	High Energy Physics - Phenomenology Astrophysics - Cosmology and Nongalactic Astrophysics
Druh dokumentu:	Working Paper
DOI:	10.1140/epjc/s10052-019-6550-9
Popis:	We study production of dark matter (DM) in models with a non-standard expansion history. We consider both freeze-out and freeze-in mechanisms for producing the observed DM abundance in a model where the DM consists of scalar singlet particles coupled to the Standard Model sector via the Higgs portal. We show that a non-standard expansion phase can lead to a significant change in the DM abundance and therefore to observational ramifications. For example, for DM freeze-in the required portal coupling can be much larger, whereas for DM freeze-out much smaller values become allowed. We evaluate the relevant constraints and discuss prospects for direct detection of such DM. Comment: V1: 17 pages, 4 figures. V2: matches version published in EPJC
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1806.11122 Zobrazit plný text záznamu View this record from Arxiv