Europhys. Lett.
Volume 76, Number 6, December 2006
Page(s) 1064 - 1067
Section General
Published online 24 November 2006
Europhys. Lett., 76 (6), pp. 1064-1067 (2006)
DOI: 10.1209/epl/i2006-10393-0

A time variation of proton-electron mass ratio and grand unification

X. Calmet1 and H. Fritzsch2

1  Service de Physique Théorique - CP225, Boulevard du Triomphe B-1050 Brussels Belgium
2  Sektion Physik, Universität München - Theresienstr. 37A D-80333 München Germany

received 3 October 2006; accepted 23 October 2006
published online 24 November 2006

Astrophysical observations indicate a time variation of the proton-electron mass ratio and of the fine-structure constant. We discuss this phenomenon in models of Grand Unification. In these models a time variation of the fine-structure constant and of the proton mass are expected, if either the unified coupling constant or the scale of unification changes, or both change. We discuss in particular the change of the proton mass. Experiments in Quantum Optics could be done to check these ideas.

06.20.Jr - Determination of fundamental constants.
12.10.Kt - Unification of couplings; mass relations.
12.10.Dm - Unified theories and models of strong and electroweak interactions.

© EDP Sciences 2006