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Article
Small-instanton transitions in F-theory
We study the phase transition between G-instantons and D3-branes quantitatively. A G-instanton is a classical solution to the self-dual equation of the M/F-theory three-form tensor field C in the complex fourfold...
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Article
Open AccessAligned natural inflation in the Large Volume Scenario
We embed natural inflation in an explict string theory model and derive observables in cosmology. We achieve this by compactifying the type IIB string on a Calabi-Yau orientifold, stabilizing moduli via the La...
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Article
Open AccessThe classical double copy for half-maximal supergravities and T-duality
We study the classical double copy for ungauged half-maximal supergravities using the Kaluza-Klein reduction of double field theory (DFT). We construct a general formula for the Kaluza-Klein (KK) reduction of ...
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Article
Open Access\(\mathbf {O}(D,D)\) completion of the Friedmann equations
In string theory the closed-string massless NS-NS sector forms a multiplet of \(\mathbf {O}(D,D)\) ...
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Article
Open AccessEinstein double field equations
Upon treating the whole closed string massless sector as stringy graviton fields, Double Field Theory may evolve into Stringy Gravity, i.e. the stringy augmentation of General Relativity. Equipped with an ...
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Article
Open AccessSpin(7) compactifications and 1/4-BPS vacua in heterotic supergravity
We continue the investigation into non-maximally symmetric compactifications of the heterotic string. In particular, we consider compactifications where the internal space is allowed to depend on two or more e...
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Article
Open AccessDark radiation in anisotropic LARGE volume compactifications
Dark radiation is a compelling extension to ΛCDM: current experimental results hint at ΔN eff ≳0.5, which is increased to ΔN eff ≃1 if the recent BI...
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Article
Loop corrections to ΔN eff in large volume models
In 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 the impact of l...
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Article
Soft supersymmetry breaking in anisotropic LARGE volume compactifications
We study soft supersymmetry breaking terms for anisotropic LARGE volume compactifications, where the bulk volume is set by a fibration with one small four-cycle and one large two-cycle. We consider scenarios w...
