# Geometric phases

- Institution: CERN
- Department: CERN Academic Training Lecture,276
- Speaker: Michael Victor Berry
- Year: 1993
- Level: Graduate
- Language: English
- Subjects: Physics
- Source: [CERN](https://videos.cern.ch/record/3025276)
- 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)

An elementary account will be given of the mathematical phenomenon of "global change without local change", i.e. anholonomy, applied tp phases in quantum mechanics and angles in classical mechanics. Phases and angles in photons, electrons, and molecules will be discussed, with a historical emphasis. More advanced topics may include a detailed illustration of the vector and scalar gauge forces associated with the geometric reaction of a light system or a heavy one (modern Born-Oppenheimer theory) and its relation to recent developments in asymptotics..

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## Lectures

1. [Geometric phases](https://invisiblenetwork.ai/learn/cern/3025276/e994284aaaaf), 58 min (CERN's player)