https://doi.org/10.1140/epjc/s10052-019-6550-9
Regular Article - Theoretical Physics
Scalar singlet dark matter in non-standard cosmologies
1
Centro de Investigaciones, Universidad Antonio Nariño, Carrera 3 Este # 47A-15, Bogotá, Colombia
2
Departamento de Física e Astronomia, Faculdade de Ciências da Universidade do Porto and Centro de Física do Porto, Rua do Campo Alegre 687, 4169-007, Porto, Portugal
3
Astronomy Unit, Queen Mary University of London, Mile End Road, London, E1 4NS, UK
4
NICPB, Rävala pst. 10, 10143, Tallinn, Estonia
* e-mail: nicolas.bernal@uan.edu.co
Received:
9
July
2018
Accepted:
21
December
2018
Published online:
16
January
2019
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.
© The Author(s), 2019