386 citations · 1.3k across the 33 of their papers we have counts for
16 papers · 1 filter
Racetrack Inflation and Cosmic Strings
Philippe Brax, Carsten van de Bruck, Anne-Christine Davis +3
We consider the coupling of racetrack inflation to matter fields as realised in the D3/D7 brane system. In particular, we investigate the possibility of cosmic string formation in…
The Robustness of n_s < 0.95 in Racetrack Inflation
Ph. Brax, Stephen C. Davis, M. Postma
A spectral index n_s < 0.95 appears to be a generic prediction of racetrack inflation models. Reducing a general racetrack model to a single-field inflation model with a simple pot…
Solar System Constraints on f(G) Dark Energy
Stephen C. Davis
Corrections to solar system gravity are derived for f(G) gravity theories, in which a function of the Gauss-Bonnet curvature term is added to the gravitational action. Their effect…
Solar System Constraints on Gauss-Bonnet Dark Energy
Stephen C. Davis
Quadratic curvature Gauss-Bonnet gravity may be the solution to the dark energy problem, but a large coupling strength is required. This can lead to conflict with laboratory and pl…
Coupling Hybrid Inflation to Moduli
Ph. Brax, C. van de Bruck, A. C. Davis +1
Hybrid inflation can be realised in low-energy effective string theory, as described using supergravity. We find that the coupling of moduli to F-term hybrid inflation in supergrav…
Fermionic Zero Modes of Supergravity Cosmic Strings
Ph. Brax, C. van de Bruck, A. C. Davis +1
Recent developments in string theory suggest that cosmic strings could be formed at the end of brane inflation. Supergravity provides a realistic model to study the properties of s…
Constraints on Gauss-Bonnet Gravity in Dark Energy Cosmologies
Luca Amendola, Christos Charmousis, Stephen C. Davis
Models with a scalar field coupled to the Gauss-Bonnet Lagrangian appear naturally from Kaluza-Klein compactifications of pure higher-dimensional gravity. We study linear, cosmolog…
Local Axion Cosmic Strings from Superstrings
Stephen C. Davis, Pierre Binetruy, Anne-Christine Davis
Axionic cosmic string solutions are investigated in a superstring motivated model with a pseudo-anomalous U(1) gauge symmetry. The inclusion of a gauge field and spatially varying…
Gauss-Bonnet Brane World Gravity with a Scalar Field
Stephen C. Davis
The effective four-dimensional, linearised gravity of a brane world model with one extra dimension and a single brane is analysed. The model includes higher order curvature terms (…
Modified Large Distance Newton Potential on a Gauss-Bonnet Brane World
Stephen C. Davis
Gravity on a brane world with higher order curvature terms and a conformally coupled bulk scalar field is investigated. Solutions with non-standard large distance gravity are descr…
Gravity on a Dilatonic Gauss-Bonnet Brane World
Stephen C. Davis
The effective four-dimensional, linearised gravity of a Randall-Sundrum-like brane world model is analysed. The model includes higher order curvature terms (such as the Gauss-Bonne…
Scalar brane backgrounds in higher order curvature gravity
Christos Charmousis, Stephen C. Davis, Jean-Francois Dufaux
We investigate maximally symmetric brane world solutions with a scalar field. Five-dimensional bulk gravity is described by a general lagrangian which yields field equations contai…
Improving the `self-tuning' mechanism with a Gauss-Bonnet term
Stephen C. Davis
The effects of higher order gravity terms on a dilatonic brane world model are discussed. For a single positive tension flat 3-brane, and one infinite extra dimension, we present a…
Generalised Israel Junction Conditions for a Gauss-Bonnet Brane World
Stephen C. Davis
In spacetimes of dimension greater than four it is natural to consider higher order (in R) corrections to the Einstein equations. In this letter generalized Israel junction conditi…
Avoidance of Naked Singularities in Dilatonic Brane World Scenarios with a Gauss-Bonnet Term
Pierre Binetruy, Christos Charmousis, Stephen C Davis +1
We consider, in 5 dimensions, the low energy effective action induced by heterotic string theory including the leading stringy correction of order alpha'. In the presence of a sing…
Cosmological Brane World Solutions with Bulk Scalar Fields
Stephen C. Davis
Cosmological brane world solutions are found for five-dimensional bulk spacetimes with a scalar field. A supergravity inspired method for obtaining static solutions is combined wit…