Preheating in Palatini Higgs inflation

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http://hdl.handle.net/10138/315070

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Rubio Pena , J & Tomberg , E S 2019 , ' Preheating in Palatini Higgs inflation ' , Journal of Cosmology and Astroparticle Physics , vol. 2019 , no. 4 , 021 . https://doi.org/10.1088/1475-7516/2019/04/021

Title: Preheating in Palatini Higgs inflation
Author: Rubio Pena, Javier; Tomberg, Eemeli S.
Contributor: University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Department of Physics
Date: 2019-04-12
Language: eng
Number of pages: 23
Belongs to series: Journal of Cosmology and Astroparticle Physics
ISSN: 1475-7516
URI: http://hdl.handle.net/10138/315070
Abstract: We study the details of preheating in Palatini Higgs inflation. We show, that contrary to what happens in the metric formulation of the model, the Universe does not reheat through the creation of gauge bosons only, but also through the tachyonic production of Higgs excitations. The latest entropy production channel turns out to be very efficient and leads to an almost instantaneous onset of radiation domination after the end of inflation. As compared to the metric case, this reduces the number of e-folds needed to solve the usual hot big bang problems while leading to a smaller spectral index for the primordial spectrum of density perturbations.
Subject: hep-ph
astro-ph.CO
gr-qc
114 Physical sciences
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