Oct 12 – 15, 2021
CERN
Europe/Zurich timezone

Ultra-high frequency gravitational waves from alpha-attractor models of inflation

Oct 12, 2021, 3:15 PM
25m
Zoom only (CERN)

Zoom only

CERN

Speaker

Laura Iacconi (Institute of Cosmology and Gravitation (University of Portsmouth))

Description

We consider primordial gravitational waves induced by large density perturbations generated by inflation in the very early universe. Cosmological alpha-attractors stand out as particularly compelling models to describe inflation, naturally meeting tight observational bounds from cosmic microwave background (CMB) experiments. We investigate alpha-attractor potentials in presence of an inflection point. The curvature perturbation is enhanced at high frequencies, which can lead to primordial black holes production and second-order gravitational waves. Consistency with the current CMB measurements implies that PBHs can only be produced with masses smaller than 10^8 g and are accompanied by ultra-high frequency gravitational waves, with a peak expected to be at frequencies of order 1MHz or above.

Presentation materials