WIMP dark matter and unitarity-conserving inflation via a gauge singlet scalar

Kahlhoefer, Felix and McDonald, John (2015) WIMP dark matter and unitarity-conserving inflation via a gauge singlet scalar. Journal of Cosmology and Astroparticle Physics, 2015 (11). ISSN 1475-7516

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Abstract

A gauge singlet scalar with non-minimal coupling to gravity can drive inflation and later freeze out to become cold dark matter. We explore this idea by revisiting inflation in the singlet direction (S-inflation) and Higgs Portal Dark Matter in light of the Higgs discovery, limits from LUX and observations by Planck. We show that large regions of parameter space remain viable, so that successful inflation is possible and the dark matter relic abundance can be reproduced. Moreover, the scalar singlet can stabilise the electroweak vacuum and at the same time overcome the problem of unitarity-violation during inflation encountered by Higgs Inflation, provided the singlet is a real scalar. The 2-σ Planck upper bound on ns imposes that the singlet mass is below 2 TeV, so that almost the entire allowed parameter range can be probed by XENON1T

Item Type:
Journal Article
Journal or Publication Title:
Journal of Cosmology and Astroparticle Physics
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3103
Subjects:
ID Code:
81199
Deposited By:
Deposited On:
22 Aug 2016 09:24
Refereed?:
Yes
Published?:
Published
Last Modified:
19 Feb 2020 03:19