Dynamical gauge coupling unification from moduli stabilization

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In D-brane models, different part of the 4-dimensional gauge group might originate from D-branes wrapping different cycles in the internal space, and then the standard model gauge couplings at the compactification scale are determined by different cycle-volume moduli. We point out that those cycle-volume moduli can naturally have universal vacuum expectation values up to small deviations suppressed by 1/8 pi(2) if they are stabilized by KKLT-type non-perturbative superpotential with properly chosen discrete parameters. This dynamical unification of gauge couplings is independent of the detailed form of the moduli Kahler potential, but relies crucially on the existence of low energy supersymmetry. If supersymmetry is broken by an uplifting brane as in KKLT compactification, again independently of the detailed form of the moduli Kahler potential, the moduli-mediated gaugino masses at the compactification scale are universal also, and are comparable to the anomaly-mediated gaugino masses. As a result, both the gauge coupling unification at high energy scale and the mirage mediation pattern of soft supersymmetry breaking masses are achieved naturally even when the different sets of the standard model gauge bosons originate from D-branes wrapping different cycles in the internal space. (c) 2006 Elsevier BN. All rights reserved.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2006-11
Language
English
Article Type
Article
Keywords

SOFT SUPERSYMMETRY BREAKING; GRAND UNIFICATION; SUPERGRAVITY; ELECTROWEAK; HIERARCHY; CONSTANTS; PHYSICS; MODELS

Citation

PHYSICS LETTERS B, v.642, pp.404 - 410

ISSN
0370-2693
DOI
10.1016/j.physletb.2006.10.006
URI
http://hdl.handle.net/10203/91377
Appears in Collection
PH-Journal Papers(저널논문)
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