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Article
Open AccessPQ axiverse
We show that the strong CP problem is solved in a large class of compactifications of string theory. The Peccei-Quinn mechanism solves the strong CP problem if the CP-breaking effects of the ultraviolet comple...
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Article
Non-Holomorphic Cycles and Non-BPS Black Branes
We study extremal non-BPS black holes and strings arising in M-theory compactifications on Calabi–Yau threefolds, obtained by wrap** M2 branes on non-holomorphic 2-cycles and M5 branes on non-holomorphic 4-c...
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Article
Open AccessThe desert and the swampland
The most natural expectation away from asymptotic limits in moduli space of supergravity theories is the desert scenario, where there are few states between massless fields and the quantum gravity cutoff. In this...
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Open Access6D anomaly-free matter spectrum in F-theory on singular spaces
In this paper we study the 6d localized charged matter spectrum of F-theory directly on a singular elliptic Calabi-Yau 3-fold, i.e. without smoothing via resolution or deformation of the entire fibration. Give...
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Open AccessGravitational waves from dark Yang-Mills sectors
Dark Yang-Mills sectors, which are ubiquitous in the string landscape, may be reheated above their critical temperature and subsequently go through a confining first-order phase transition that produces stocha...
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Article
Open AccessInstanton resummation and the Weak Gravity Conjecture
We develop methods for resummation of instanton lattice series. Using these tools, we investigate the consequences of the Weak Gravity Conjecture for large-field axion inflation. We find that the Sublattice We...
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Open AccessThe Kreuzer-Skarke axiverse
We study the topological properties of Calabi-Yau threefold hypersurfaces at large h1,1. We obtain two million threefolds X by triangulating polytopes from the Kreuzer-Skarke list, including all polytopes with 24...
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Open AccessMinimal surfaces and weak gravity
We show that the Weak Gravity Conjecture (WGC) implies a nontrivial upper bound on the volumes of the minimal-volume cycles in certain homology classes that admit no calibrated representatives. In compactifica...
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Open AccessNon-simply-laced symmetry algebras in F-theory on singular spaces
We demonstrate how non-simply-laced gauge and flavor symmetries arise in F-theory on spaces with non-isolated singularities. The breaking from a simply-laced symmetry to one that is non-simply-laced is induced...
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Open AccessThe singularity structure of scale-invariant rank-2 Coulomb branches
We compute the spectrum of scaling dimensions of Coulomb branch operators in 4d rank-2 N ...
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Open AccessOn the scarcity of weak coupling in the string landscape
We study the geometric requirements on a threefold base for the corresponding F-theory compactification to admit a weakly-coupled type IIB limit. We examine both the standard Sen limit and a more restrictive l...
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Open AccessSystematics of axion inflation in Calabi-Yau hypersurfaces
We initiate a comprehensive survey of axion inflation in compactifications of type IIB string theory on Calabi-Yau hypersurfaces in toric varieties. For every threefold with h 1,1 ...
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Article
Open AccessPlanckian axions and the Weak Gravity Conjecture
Several recent works [1-3] have claimed that the Weak Gravity Conjecture (WGC) excludes super-Planckian displacements of axion fields, and hence large-field axion inflation, in the absence of monodromy. We arg...
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Open AccessPlanckian axions in string theory
We argue that super-Planckian diameters of axion fundamental domains can arise in Calabi-Yau compactifications of string theory. In a theory with N axions θ i ...
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Open AccessHeavy tails in Calabi-Yau moduli spaces
We study the statistics of the metric on Kähler moduli space in compactifications of string theory on Calabi-Yau hypersurfaces in toric varieties. We find striking hierarchies in the eigenvalues of the metric ...
