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Article
Stringy hidden valleys
We study gauge theories where quasi-hidden sectors are added to the MSSM for the sake of string consistency conditions which would otherwise not be satisfied. We focus on quiver gauge theories motivated by wea...
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Article
Ultraviolet completions of axigluon models and their phenomenological consequences
The CDF and D0 collaborations have observed a forward-backward asymmetry in \( t\overline{t} \) production at large inv...
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Article
On seven-brane dependent instanton prefactors in F-theory
We study the moduli-dependent prefactor of M5-instanton corrections to the superpotential in four-dimensional F-theory compactifications. In light of the M-theory and type IIb limits and also heterotic duality...
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Article
Three looks at instantons in F-theory — New insights from anomaly inflow, string junctions and heterotic duality
We discuss the physics of zero modes of ED3/M5 instantons at strong coupling from three different viewpoints. Motivated by an anomaly inflow argument, we give a prescription for describing neutral instanton mo...
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Article
Implications of string constraints for exotic matter and Z′ s beyond the standard model
Global consistency of string compactifications places constraints on the chiral matter spectrum of a gauge theory which include those necessary for the absence of cubic nonabelian anomalies, but also contain s...
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Article
Open AccessGlobal F-theory models: instantons and gauge dynamics
We present and analyze in detail a compact F-theory GUT model in which D-brane instantons generate the top Yukawa coupling non-perturbatively. We elucidate certain aspects of F-theory gauge dynamics which are ...
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Article
The Weinberg operator and a lower string scale in orientifold compactifications
We investigate the interplay between the string scale and phenomenological scales in orientifold compactifications. Specifically, we discuss in generality the tension that often arises in accounting for neutri...
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Article
Open AccessSinglet extensions of the MSSM in the quiver landscape
We map out possible extensions of the MSSM in the context of type II string theory. We systematically investigate three-stack and four-stack quivers which realize the MSSM spectrum with the addition of a singl...
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Article
Mass hierarchies from MSSM orientifold compactifications
We investigate phenomenologically viable four- and five-stack MSSM D-brane quivers which exhibit realistic fermion mass hierarchies. In our analysis, the mass hierarchies arise either from higher order terms c...
