Hidden inflaton dark matter

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Beltran Almeida , J P , Bernal , N , Rubio , J & Tenkanen , T 2019 , ' Hidden inflaton dark matter ' , Journal of Cosmology and Astroparticle Physics , vol. 2019 , no. 3 , 012 . https://doi.org/10.1088/1475-7516/2019/03/012

Title: Hidden inflaton dark matter
Author: Beltran Almeida, Juan P.; Bernal, Nicolas; Rubio, Javier; Tenkanen, Tommi
Contributor: University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Johns Hopkins University
Date: 2019-03
Language: eng
Number of pages: 36
Belongs to series: Journal of Cosmology and Astroparticle Physics
ISSN: 1475-7516
URI: http://hdl.handle.net/10138/300374
Abstract: If cosmic inflation was driven by an electrically neutral scalar field stable on cosmological time scales, the field necessarily constitutes all or part of dark matter (DM). We study this possibility in a scenario where the inflaton field s resides in a hidden sector, which is coupled to the Standard Model sector through the Higgs portal lambda(hs)s(2) (HH)-H-dagger and non-minimally to gravity via xi(s)s(2)R. We study scenarios where the field s first drives inflation, then reheats the Universe, and later constitutes all DM. We consider two benchmark scenarios where the DM abundance is generated either by production during reheating or via non-thermal freeze-in. In both cases, we take into account all production channels relevant for DM in the mass range from keV to PeV scale. On the inflationary side, we compare the dynamics and the relevant observables in two different but well-motivated theories of gravity (metric and Palatini), discuss multi field effects in case both fields (s and h) were dynamical during inflation, and take into account the non-perturbative nature of particle production during reheating. We find that, depending on the initial conditions for inflation, couplings and the DM mass, the scenario works well especially for large DM masses, 10(2) GeV less than or similar to m(s) less than or similar to 10(6) GeV, although there are also small observationally allowed windows at the keV and MeV scales. We discuss how the model can be tested through astrophysical observations.
Subject: cosmology of theories beyond the SM
dark matter theory
particle physics - cosmology connection
114 Physical sciences
115 Astronomy, Space science

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