TY - JOUR
TI - Spectrum oscillations from features in the potential of single-field
inflation
AU - Dalianis, I
AU - Kodaxis, G. P.
AU - Stamou, I. D.
AU - Tetradis, N. and
AU - Tsigkas-Kouvelis, A.
JO - Physical Review D
PY - 2021
VL - 104
TODO - 10
SP - null
PB - AMER PHYSICAL SOC
SN - 2470-0010, 2470-0029
TODO - 10.1103/PhysRevD.104.103510
TODO - null
TODO - We study single-field inflationary models with steep steplike features
in the potential that lead to the temporary violation of the slow-roll
conditions during the evolution of the inflaton. These features enhance
the power spectrum of the curvature perturbations by several orders of
magnitude at certain scales and also produce prominent oscillatory
patterns. We study analytically and numerically the inflationary
dynamics. We describe quantitatively the size of the enhancement, as
well as the profile of the oscillations, which are shaped by the number
and position of the features in the potential. The induced tensor power
spectrum inherits the distinctive oscillatory profile of the curvature
spectrum and is potentially detectable by nearfuture space
interferometers. The enhancement of the power spectrum by steplike
features, though significant, may be insufficient to trigger the
production of a sizable number of primordial black holes if radiation
dominates the energy density of the early Universe. However, it can
result in sufficient black hole production if the Universe is dominated
by nonrelativistic matter. For the latter scenario, we find that
deviations from the standard monochromatic profile of the mass spectrum
of primordial black holes are possible because of the multiple-peak
structure of the curvature power spectrum.
ER -