# Thermalization Under Generalized Symmetries

- Institution: CERN
- Speaker: Joao C. Pinto Barros
- Year: 2026
- Language: English
- Source: [CERN](https://videos.cern.ch/record/3025680)
- Licence: [CERN](https://copyright.web.cern)
- Who can watch: Teens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

In the last few years, many instances of local Hamiltonians with abnormal thermalization properties have been found. These include models with Hilbert space fragmentation and quantum many-body scars. In an ideal scenario, we would like to characterize the conditions under which abnormal thermalization can occur and, if it does, predict its characteristics. In this talk, I will demonstrate how generalized symmetries can lead to an exponential increase in the number of disconnected sectors of the Hilbert space, which has been taken as evidence of ergodicity breaking. I will argue that, in certain instances, this should not be regarded as ergodicity-breaking, namely when it can be fully explained within the framework of generalized symmetries, including non-invertible symmetries, that have been largely unexplored in this context. Notable examples include the PXP model and gauge theories, particularly Quantum Link Models in higher dimensions.

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## Lectures

1. [Thermalization Under Generalized Symmetries](https://invisiblenetwork.ai/learn/cern/3025680/1a33cd94b00b), 1 h 6 min (CERN's player)