Varying Couplings From Orbifold GUTs

2002/11/08 by Filipe Paccetti Correia, Correia, Filipe Paccetti, Michael G. Schmidt +3
Physics and Astronomy · #Astrophysics (astro-ph) #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High Energy Physics - Theory (hep-th) #astro-ph #hep-ph #hep-th

paper · pdf · doi:10.48550/arxiv.hep-ph/0211122

Discussions and references added

arxiv created 2002/12/09 · arxiv updated 2009/11/30

Abstract

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 \al₃ and to relate it to a variation of α_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 \al₃(M_Z) variation.

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