Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-08-31
Nucl.Phys. B567 (2000) 111-132
Physics
High Energy Physics
High Energy Physics - Phenomenology
24 pages, LaTeX, no figures
Scientific paper
It has recently been proposed that gravity-localized compactifications can generate the required gauge hierarchy without the need for hierarchically large extra spacetime dimensions. In this paper, we show that gauge coupling unification arises naturally in such scenarios as a result of the anomaly induced by the rescaling of the wavefunctions of the brane fields. Thus, ``anomaly-induced'' gauge coupling unification can easily explain the apparent low-energy gauge couplings in gravity-localized compactifications. However, we also point out a number of phenomenological difficulties with such compactifications, including an inability to accommodate the GUT scale and the electroweak scale simultaneously. We also show that brane/bulk couplings in this scenario are generically too small to be phenomenologically relevant. Finally, we speculate on possible resolutions to these puzzles.
Dienes Keith R.
Dudas Emilian
Gherghetta Tony
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