# On adiabatic renormalization with an infrared cut-off

- Institution: CERN
- Department: TH institutes
- Speaker: Pietro Conzinu
- Year: 2024
- Language: English
- Source: [CERN](https://videos.cern.ch/record/2302487)
- 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 describe a new approach to renormalize physical quantities in curved space-time introducing a comoving infrared cut-off in defining the adiabatic counterpart of the physical quantity under consideration. This infrared cut-off is fundamental to avoid unphysical divergences that can be generated by a pathological behavior of the adiabatic subtraction extended to the infrared domain. Applying such formalism to symptomatic case of U(1)-axion inflation model, we evaluate properly the expectation value of gauge contribution setting the cut-off by the conformal anomaly..

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## Lectures

1. [On adiabatic renormalization with an infrared cut-off](https://invisiblenetwork.ai/learn/cern/2302487/c39d35e29a90), 22 min (CERN's player)