%0 Unpublished work
%T Hybrid inflation and gravitational waves from accidentally light scalars
%+ Laboratoire Univers et Particules de Montpellier (LUPM)
%+ Laboratoire Charles Coulomb (L2C)
%A BrÃ¼mmer, Felix
%A Ferrante, Giacomo
%A Frigerio, Michele
%8 2024-06-12
%D 2024
%Z 2406.02531
%K inflation, hybrid
%K symmetry, gauge
%K defect, topological
%K inflaton, potential
%K gravitational radiation, background
%K scale, inflation
%K gravitational radiation, stochastic
%K preheating
%K tree approximation
%K tachyon
%K domain wall
%K cosmic background radiation
%K correlation
%K pulsar
%Z Physics [physics]/Astrophysics [astro-ph]
%Z Physics [physics]/High Energy Physics - Phenomenology [hep-ph]
%Z Physics [physics]/High Energy Physics - Theory [hep-th]Preprints, Working Papers, ...
%X We construct a hybrid-inflation model where the inflaton potential is generated radiatively, as gauge symmetries guarantee it to be accidentally flat at tree level. The model can be regarded as a small-field version of Natural Inflation, with inflation ending when the mass of a second scalar, the waterfall field, turns tachyonic. This provides a minimal, robust realisation of hybrid inflation, which predicts specific correlations among CMB observables. Tachyonic preheating leads to the production of gravitational waves which, for a low inflationary scale, might be detected by upcoming experiments. Simple variations of the model can give rise to topological defects, such as unstable domain walls. Their dynamics produces a stochastic gravitational-wave background, which can be compatible with the recent detection by pulsar timing arrays.
%G English
%L hal-04609830
%U https://hal.science/hal-04609830
%~ IN2P3
%~ CNRS
%~ L2C
%~ LUPM
%~ MIPS
%~ UNIV-MONTPELLIER
%~ LUPM_IFAC
%~ UM-2015-2021
%~ UM-EPE