TY - JOUR

T1 - Preheating in Palatini Higgs inflation

AU - Rubio, Javier

AU - Tomberg, Eemeli S.

PY - 2019/4/12

Y1 - 2019/4/12

N2 - 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.

AB - 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.

KW - ination

KW - modified gravity

KW - particle physics-cosmology connection

KW - physics of the early universe

U2 - 10.1088/1475-7516/2019/04/021

DO - 10.1088/1475-7516/2019/04/021

M3 - Journal article

AN - SCOPUS:85069687865

VL - 2019

JO - Journal of Cosmology and Astroparticle Physics

JF - Journal of Cosmology and Astroparticle Physics

SN - 1475-7516

IS - 4

M1 - 021

ER -