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  • 1803.07399

    Rights statement: 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

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    Embargo ends: 12/06/19

    Available under license: CC BY-NC: Creative Commons Attribution-NonCommercial 4.0 International License

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Non-minimal gravitational reheating during kination

Research output: Contribution to journalJournal article

Published
Article number021
<mark>Journal publication date</mark>12/06/2018
<mark>Journal</mark>Journal of Cosmology and Astroparticle Physics
Issue number6
Volume2018
Number of pages21
Pages (from-to)0-20
StatePublished
Original languageEnglish

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.

Bibliographic note

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