Non-minimal gravitational reheating during kination

Dimopoulos, Konstantinos and Markkanen, Tommi (2018) Non-minimal gravitational reheating during kination. Journal of Cosmology and Astroparticle Physics, 2018 (6). 0-20. ISSN 1475-7516

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Abstract

A new mechanism is presented which can reheat the Universe in non-oscillatory models of inflation, where the inflation period is followed by a period dominated by the kinetic density for the inflaton field (kination). The mechanism considers an auxiliary field non-minimally coupled to gravity. The auxiliary field is a spectator during inflation, rendered heavy by the non-minimal coupling to gravity. During kination however, the non-minimal coupling generates a tachyonic mass, which displaces the field, until its bare mass becomes important, leading to coherent oscillations. Then, the field decays into the radiation bath of the hot big bang. The model is generic and predictive, in that the resulting reheating temperature is a function only of the model parameters (masses and couplings) and not of initial conditions. It is shown that reheating can be very efficient also when considering only the Standard Model.

Item Type: Journal Article
Journal or Publication Title: Journal of Cosmology and Astroparticle Physics
Additional Information: This is an author-created, un-copyedited version of an article accepted for publication/published in Journal of Cosmology and Astroparticle Physics. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at doi: 10.1088/1475-7516/2018/06/021
Uncontrolled Keywords: /dk/atira/pure/subjectarea/aacsb/disciplinebasedresearch
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 125839
Deposited By: ep_importer_pure
Deposited On: 14 Jun 2018 08:08
Refereed?: Yes
Published?: Published
Last Modified: 26 Feb 2020 04:29
URI: https://eprints.lancs.ac.uk/id/eprint/125839

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