Varying Couplings From Orbifold GUTs

Details Varying Couplings From Orbifold GUTs Varying Couplings From Orbifold GUTs

2002-11-08

arxiv.org/abs/hep-ph/0211122v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

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Scientific paper

We discuss the variation of gauge couplings in time in the framework of orbifold constructions, due to a change of the extra compact dimension's size. Models with gauge coupling unification allow to estimate the variation of the strong coupling constant $\al_3$ and to relate it to a variation of $\alpha_{em}$. The extra-dimensional construction turns out to be crucial for the model to be compatible with data. Within the presented 5D scenarios, the tower of KK states significantly affects gauge coupling running, leads to low scale unification, and provides a suppression of the $\al_3(M_Z)$ variation.

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