# Fundamental Constants in Physics and their Time Dependence

- Institution: CERN
- Department: CERN Colloquium
- Speaker: Harald FRITZSCH
- Year: 2008
- Language: English
- Subjects: Physics
- Source: [CERN](https://videos.cern.ch/record/3007261)
- 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 the Standard Model of Particle Physics we are dealing with 28 fundamental constants. In the experiments these constants can be measured, but theoretically they are not understood. I will discuss these constants, which are mostly mass parameters. Astrophysical measurements indicate that the finestructure constant is not a real constant, but depends on time. Grand unification then implies also a time variation of the QCD scale. Thus the masses of the atomic nuclei and the magnetic moments of the nuclei will depend on time. I proposed an experiment, which is currently done by Prof. Haensch in Munich and his group. The first results indicate a time dependence of the QCD scale. I will discuss the theoretical implications..

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## Lectures

1. [Fundamental Constants in Physics and their Time Dependence](https://invisiblenetwork.ai/learn/cern/3007261/060438ee159b), 1 h (CERN's player)