Mirage gauge coupling unification
Abstract
We use compact D=4, N=1, Type IIB orientifolds as a testing ground for recent ideas about precocious gauge coupling unification and a low energy string scale. We find that certain such orientifolds have the interesting property that gauge couplings receive modulidependent corrections which mimic the effect of field theoretical logarithmic running. The effective cutoff scale for the logarithmic correction is not $M_{string}$ but rather $M_X=\sqrt{\alpha}M_{Planck}M_c/M_{string}$, where $M_c$ is the compactification scale. Thus there is just normal logarithmic running up to $M_{string}$ and extra moduli dependent corrections which behave as if there was further running to a higher virtual scale $M_X$. In this mechanism a prominent role is played by anomalous U(1)'s with moduli dependent FayetIliopoulos terms. A vanishing FIterm fixes the modulus dependence of the corrected gauge coupling. We discuss possible ways to implement this mechanism in the context of a simple extension of the MSSM.
 Publication:

arXiv eprints
 Pub Date:
 May 1999
 arXiv:
 arXiv:hepph/9905349
 Bibcode:
 1999hep.ph....5349I
 Keywords:

 High Energy Physics  Phenomenology;
 High Energy Physics  Theory
 EPrint:
 15 pages, 1 figure