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Curvature and isocurvature perturbations in two-field inflation
We study cosmological perturbations in two-field inflation, allowing for non-standard kinetic terms. We calculate analytically the spectra of curvature and isocurvature modes at Hubble crossing, upExpand
Supersymmetrizing branes with bulk in five-dimensional supergravity
Abstract We supersymmetrize a class of moduli dependent potentials living on branes with the help of additional bulk terms in 5d N =2 supergravity. The resulting theories are gauged supergravitiesExpand
Strongly coupled perturbations in two-field inflationary models
We study models of inflation with two scalar fields and non-canonical kinetic terms, focusing on the case in which the curvature and isocurvature perturbations are strongly coupled to each other. InExpand
Racetrack inflation and assisted moduli stabilisation
We present a model of inflation based on a racetrack model without flux stabilization. The initial conditions are set automatically through topological inflation. This ensures that the dilaton is notExpand
Gravity in gauge mediation
We investigate O'Raifeartaigh-type models for F-term supersymmetry break- ing in gauge mediation scenarios in the presence of gravity. It is pointed out that the vacuum structure of those models isExpand
GAUGINO CONDENSATION, MODULI POTENTIAL AND SUPERSYMMETRY BREAKING IN M-THEORY MODELS
Abstract We derive the explicit form, and discuss some properties of the moduli-dependent effective potential arising from M-theory compactified on M 4 × X × S 1 / Z 2 , when one of the boundariesExpand
Universal constraints on low-energy flavour models
A bstractIt is pointed out that in a general class of flavour models one can identify certain universally present FCNC operators, induced by the exchange of heavy flavour messengers. TheirExpand
Target space duality in heterotic and Type I effective Lagrangians
Abstract We study the implications of target-space duality symmetries for low-energy effective actions of various four-dimensional string theories. In the heterotic case such symmetries can beExpand
The cosmological constant problem from a brane-world perspective
We point out several subtleties arising in brane-world scenarios of cosmological constant cancellation. We show that solutions with curvature singularities are inconsistent, unless the contributionExpand
Non-BPS branes of supersymmetric brane worlds
Abstract We consider five-dimensional brane worlds with N =2 gauged supergravity in the bulk coupled supersymmetrically to two boundary branes at the fixed points of a Z 2 symmetry. We analyse twoExpand
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