Aspects of flavour and supersymmetry in F-theory GUTs
AbstractWe study the constraints of supersymmetry on flavour in recently proposed models of F-theory GUTs. We relate the topologically twisted theory to the canonical presentation of eight-dimensional...
View ArticleOne-loop Yukawa couplings in local models
AbstractWe calculate the one-loop Yukawa couplings and threshold corrections for supersymmetric local models of branes at singularities in type IIB string theory. We compute the corrections coming both...
View ArticleSuperpotential de-sequestering in string models
AbstractNon-perturbative superpotential cross-couplings between visible sector matter and Kähler moduli can lead to significant flavour-changing neutral currents in compactifications of type IIB string...
View ArticleThe cosmophenomenology of axionic dark radiation
AbstractRelativistic axions are good candidates for the dark radiation for which there are mounting observational hints. The primordial decays of heavy fields produce axions which are ultra-energetic...
View ArticleLoop corrections to ΔNeff in large volume models
AbstractIn large volume models reheating is driven by the decays of the volume modulus to the visible sector, while the decays to its axion partners result in dark radiation. In this article we discuss...
View ArticleA note on the magnitude of the flux superpotential
AbstractThe magnitude of the flux superpotential Wflux plays a crucial role in determining the scales of IIB string compactifications after moduli stabilisation. It has been argued that values of...
View ArticleDe Sitter vacua from a D-term generated racetrack uplift
AbstractWe propose an uplift mechanism using a structure of multi-Kähler moduli dependence in the F-term potential of type IIB string theory compactifications. This mechanism requires a D-term...
View ArticleAxion decay constants away from the lamppost
AbstractIt is unknown whether a bound on axion field ranges exists within quantum gravity. We study axion field ranges using extended supersymmetry, in particular allowing an analysis within strongly...
View ArticlePutting the boot into the swampland
AbstractThe swampland program of delineating the space of effective field theories consistent with quantum gravity appears similar to the bootstrap program of delineating the space of quantum field...
View ArticleLife, Intelligence, and the Selection of Universes
AbstractComplexity and life as we know it depend crucially on the laws and constants of nature as well as the boundary conditions, which seem at least partly “fine-tuned.” That deserves an explanation:...
View ArticleExploring the holographic Swampland
AbstractWe extend studies of holographic aspects of moduli stabilisation scenarios to both fibred versions of LVS and the type IIA DGKT flux vacua. We study the holographic properties of the low-energy...
View ArticleCatch-me-if-you-can: the overshoot problem and the weak/inflation hierarchy
AbstractWe study the overshoot problem in the context of post-inflationary string cosmology (in particular LVS). LVS cosmology features a long kination epoch as the volume modulus rolls down the...
View ArticleKination, meet Kasner: on the asymptotic cosmology of string compactifications
AbstractWe study runaway, kination-dominated epochs in string cosmology. We show how the apparent classical decompactification runaway of the volume modulus, described by a kination epoch in the...
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