TY - JOUR

T1 - Preheating in Palatini Higgs inflation on the lattice

AU - Dux, F.

AU - Florio, A.

AU - Klaric, J.

AU - Shkerin, A.

AU - Timiryasov, I.

PY - 2022/9/6

Y1 - 2022/9/6

N2 - We study preheating following Higgs inflation in the Palatini formulation of gravity. We numerically evolve perturbations of the radial mode of the Higgs field and that of three scalars modeling the gauge bosons. We compare the two non-perturbative mechanisms of growth of excitations - parametric resonance and tachyonic instability - and confirm that the latter plays the dominant role. Our results provide further evidence that preheating in Palatini Higgs inflation happens within a single oscillation of the Higgs field about the bottom of its potential, consistent with the approximation of an instantaneous preheating.

AB - We study preheating following Higgs inflation in the Palatini formulation of gravity. We numerically evolve perturbations of the radial mode of the Higgs field and that of three scalars modeling the gauge bosons. We compare the two non-perturbative mechanisms of growth of excitations - parametric resonance and tachyonic instability - and confirm that the latter plays the dominant role. Our results provide further evidence that preheating in Palatini Higgs inflation happens within a single oscillation of the Higgs field about the bottom of its potential, consistent with the approximation of an instantaneous preheating.

KW - inflation

KW - particle physics-cosmology connection

KW - physics of the early universe

U2 - 10.1088/1475-7516/2022/09/015

DO - 10.1088/1475-7516/2022/09/015

M3 - Journal article

JO - Journal of Cosmology and Astroparticle Physics

JF - Journal of Cosmology and Astroparticle Physics

SN - 1475-7516

IS - 9

M1 - 015

ER -