Abstract
Astrophysical indications that the fine structure constant has undergone a small time variation during the cosmological evolution are discussed within the framework of the standard model of the electroweak and strong interactions and of grand unification. A variation of the electromagnetic coupling constant could either be generated by a corresponding time variation of the unified coupling constant or by a time variation of the unification scale, or by both. The various possibilities, differing substantially in their implications for the variation of low energy physics parameters like the nuclear mass scale, are discussed. The case in which the variation is caused by a time variation of the unification scale is of special interest.
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Fritzsch, H. (2004). Fundamental Constantsand Their Possible Time Dependence. In: Karshenboim, S.G., Peik, E. (eds) Astrophysics, Clocks and Fundamental Constants. Lecture Notes in Physics, vol 648. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-40991-5_7
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DOI: https://doi.org/10.1007/978-3-540-40991-5_7
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