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R-Parity-violating supersymmetry
Theoretical and phenomenological implications of R-parity violation in supersymmetric theories are discussed in the context of particle physics and cosmology. Fundamental aspects include the relationExpand
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On hypercharge flux and exotics in F-theory GUTs
We study SU(5) Grand Unified Theories within a local framework in F-theory with multiple extra U(1) symmetries arising from a small monodromy group. The use of hypercharge flux for doublet-tripletExpand
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Gauge couplings in four-dimensional Type I string orbifolds
We compute threshold effects to gauge couplings in four-dimensional ZN orientifold models of type I strings with N = 2 and N = 1 supersymmetry, and study their dependence on the geometric moduli. WeExpand
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The Volkov–Akulov–Starobinsky supergravity
Abstract We construct a supergravity model whose scalar degrees of freedom arise from a chiral superfield and are solely a scalaron and an axion that is very heavy during the inflationary phase. TheExpand
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Supersymmetry breaking
We review the various mechanisms of supersymmetry breaking and its transmission to the observable sector. We argue that hybrid models where gauge dominates over gravity mediation, but gravityExpand
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Type-I strings on magnetised orbifolds and brane transmutation
Abstract In the presence of internal magnetic fields, a D9 brane can acquire a D5 (or anti-D5) R-R charge, and can therefore contribute to the corresponding tadpole. In the resulting vacua,Expand
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Strong moduli stabilization and phenomenology
We describe the resulting phenomenology of string theory/supergravity models with strong moduli stabilization. The KL model with F-term uplifting, is one such example. Models of this type predictExpand
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Froggatt-Nielsen models from E8 in F-theory GUTs
This paper studies F-theory SU(5) GUT models where the three generations of the standard model come from three different curves. All the matter is taken to come from curves intersecting at a point ofExpand
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Uplifting Runaways.
We find a mechanism by which antibranes placed in a warped deformed conifold throat can destroy the stabilization of the size of the sphere at the tip, collapsing it to zero size. This conifoldExpand
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Brane solutions in strings with broken supersymmetry and dilaton tadpoles
Abstract The tachyon-free nonsupersymmetric string theories in ten dimensions have dilaton tadpoles which forbid a Minkowski vacuum. We determine the maximally symmetric backgrounds for the USp (32)Expand
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