# Microscopic particle processes during bubble expansion and new high-frequency gravitational waves

- Institution: CERN
- Department: TH institutes
- Speaker: Wen-Yuan Ai
- Year: 2025
- Language: English
- Subjects: Physics
- Source: [CERN](https://videos.cern.ch/record/3021079)
- Licence: [CERN](http://copyright.web.cern.ch)
- Who can watch: Tweens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

In certain scenarios, bubble walls may reach a velocity with a very large Lorentz boost factor or run away. For such ultrarelativistic bubble walls, a new energy scale $\gamma_w T$ emerges, allowing for the production of heavy particles. I will discuss the dynamics of ultrarelativistic bubble walls and the associated heavy dark matter and gravitational wave production..

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## Lectures

1. [Microscopic particle processes during bubble expansion and new high-frequency gravitational waves](https://invisiblenetwork.ai/learn/cern/3021079/6c599de7b47b), 46 min (CERN's player)