# Axion cosmological histories

- Institution: CERN
- Department: Theory Colloquia
- Speaker: Geraldine Servant
- Year: 2023
- Language: English
- Source: [CERN](https://videos.cern.ch/record/2302624)
- 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)

I will illustrate how we can learn about axion physics by considering axion dynamics in the early universe and its phenomenological signatures. This can be used to constrain its UV completions. I will in particular discuss the rich phenomenology associated with early rotating axions, that arises from the interplayed dynamics between the axion and its partner, the radial mode of the Peccei-Quinn field. Another fascinating story is the possibility of interplayed dynamics between the axion and the Higgs at early times, that can be used as a minimal solution to the (little) hierarchy problem. .

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## Lectures

1. [Axion cosmological histories](https://invisiblenetwork.ai/learn/cern/2302624/44146bd0c42e), 1 h 9 min (CERN's player)