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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...
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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
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 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
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
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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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
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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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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New methods for characterizing phases of 2D supersymmetric gauge theories
We study the physics of two-dimensional \( \mathcal{N} \) = (2, 2) gauged linear sigma models (GLSMs) via the two-spher...
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Article
Matter from geometry without resolution
We utilize the deformation theory of algebraic singularities to study charged matter in compactifications of M-theory, F-theory, and type IIa string theory on ellipti- cally fibered Calabi-Yau manifolds. In F-...
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Article
Open AccessOn finiteness of type IIB compactifications: magnetized branes on elliptic Calabi-Yau threefolds
The string landscape satisfies interesting finiteness properties imposed by supersymmetry and string-theoretical consistency conditions. We study ...
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Article
Open AccessNon-Higgsable QCD and the standard model spectrum in F-theory
Many four-dimensional supersymmetric compactifications of F-theory contain gauge groups that cannot be spontaneously broken through geometric deformations. These “non-Higgsable clusters” include realizations o...
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Article
Perturbative Corrections to Kähler Moduli Spaces
We propose a general formula for perturbative-in-α′ corrections to the Kähler potential on the quantum Kähler moduli space of Calabi–Yau n-folds, for any n, in their asymptotic large volume regime. The knowledge ...
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Article
Open AccessThe landscape of M-theory compactifications on seven-manifolds with G2 holonomy
We study the physics of globally consistent four-dimensional N ...
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Article
Non-Abelian Gauge Symmetry and the Higgs Mechanism in F-Theory
Singular fiber resolution does not describe the spontaneous breaking of gauge symmetry in F-theory, as the corresponding branch of the moduli space does not exist in the theory. Accordingly, even non-abelian g...
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Open Access\( {\mathrm{\mathbb{P}}}^1 \) -bundle bases and the prevalence of non-Higgsable structure in 4D F-theory models
We explore a large class of F-theory compactifications to four dimensions. We find evidence that gauge groups that cannot be Higgsed without breaking supersymmetry, often accompanied by associated matter field...
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Open AccessOn gauge enhancement and singular limits in G 2 compactifications of M-theory
We study the physics of singular limits of G 2 compactifications of M-theory, which are necessary to obtain a compactification with non-abelian gauge symmetry or massless charged p...
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Article
Open AccessDualities of deformed \( \mathcal{N}=2 \) SCFTs from link monodromy on D3-brane states
We study D3-brane theories that are dually described as deformations of two different N ...
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Article
Open AccessMachine learning in the string landscape
We utilize machine learning to study the string landscape. Deep data dives and conjecture generation are proposed as useful frameworks for utilizing machine learning in the landscape, and examples of each are ...
