Despicable dark relics : generated by gravity with unconstrained masses

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http://hdl.handle.net/10138/315071

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Fairbairn , M , Kainulainen , K , Markkanen , T & Nurmi , S 2019 , ' Despicable dark relics : generated by gravity with unconstrained masses ' , Journal of Cosmology and Astroparticle Physics , vol. 2019 , no. 4 , 005 . https://doi.org/10.1088/1475-7516/2019/04/005

Title: Despicable dark relics : generated by gravity with unconstrained masses
Author: Fairbairn, Malcolm; Kainulainen, Kimmo; Markkanen, Tommi; Nurmi, Sami
Contributor: University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Department of Physics
Date: 2019-04
Language: eng
Number of pages: 25
Belongs to series: Journal of Cosmology and Astroparticle Physics
ISSN: 1475-7516
URI: http://hdl.handle.net/10138/315071
Abstract: We demonstrate the existence of a generic, efficient and purely gravitational channel producing a significant abundance of dark relics during reheating after the end of inflation. The mechanism is present for any inert scalar with the non-minimal curvature coupling xi RX2 and the relic production is efficient for modest values xi= O(1). The observed dark matter abundance can be reached for a broad range of relic masses extending from m similar to 1keV to m similar to 10(8) GeV, depending on the scale of inflation and the dark sector couplings. Frustratingly, such relics escape direct, indirect and collider searches since no non-gravitational couplings to visible matter are needed.
Subject: dark matter theory
quantum field theory on curved space
inflation
SCALAR-FIELD
MATTER
115 Astronomy, Space science
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