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

- Institution: CERN
- Department: Conferences & Workshops
- Speaker: Laura Iacconi
- Year: 2021
- Language: English
- Source: [CERN](https://videos.cern.ch/record/3018848)
- Licence: [CERN](http://copyright.web.cern.ch)
- Who can watch: Teens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

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..

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## Lectures

1. [Ultra-high frequency gravitational waves from alpha-attractor models of inflation](https://invisiblenetwork.ai/learn/cern/3018848/eab229dfd6ce), 4 min (CERN's player)