Feebly interacting dark matter particle as the inflaton

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http://hdl.handle.net/10138/174157

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Tenkanen , T 2016 , ' Feebly interacting dark matter particle as the inflaton ' , Journal of High Energy Physics , vol. 2016 , no. 09 , 049 , pp. 49 . https://doi.org/10.1007/JHEP09(2016)049

Title: Feebly interacting dark matter particle as the inflaton
Author: Tenkanen, Tommi
Contributor: University of Helsinki, Department of Physics
Date: 2016-09
Language: eng
Number of pages: 14
Belongs to series: Journal of High Energy Physics
ISSN: 1029-8479
URI: http://hdl.handle.net/10138/174157
Abstract: We present a scenario where a Z 2-symmetric scalar field ϕ first drives cosmic inflation, then reheats the Universe but remains out-of-equilibrium itself, and finally comprises the observed dark matter abundance, produced by particle decays à la freeze-in mechanism. We work model-independently without specifying the interactions of the scalar field besides its self-interaction coupling, $ϕ 4, non-minimal coupling to gravity, $ϕ 2 R, and coupling to another scalar field, gϕ 2 $ 2. We find the scalar field ϕ serves both as the inflaton and a dark matter candidate if 10−9 ≲ $ ≲ g ≲ 10−7 and 3 keV ≲ m ϕ ≲ 85 MeV for $ = O 1 backslashxi =backslashmathcalO(1) . Such a small value of the non-minimal coupling is also found to be of the right magnitude to produce the observed curvature perturbation amplitude within the scenario. We also discuss how the model may be distinguished from other inflationary models of the same type by the next generation CMB satellites.
Subject: 114 Physical sciences
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