121 citations · 328 across the 8 of their papers we have counts for
7 papers · 1 filter
On graviton production in braneworld cosmology
Cyril Cartier, Ruth Durrer, Marcus Ruser
We study braneworlds in a five dimensional bulk, where cosmological expansion is mimicked by motion through AdS. We show that the five dimensional graviton reduces to the four…
Tachyonic perturbations in AdS orbifolds
Cyril Cartier, Ruth Durrer
We show that scalar as well as vector and tensor metric perturbations in the Randall-Sundrum II braneworld allow normalizable tachyonic modes, i.e., possible instabilities. These i…
Scalar perturbations in an -regularised cosmological bounce
Cyril Cartier
We consider the evolution of scalar perturbations in a class of non-singular bouncing universes obtained with higher-order corrections to the low-energy bosonic string action. We s…
Cosmological perturbations and the transition from contraction to expansion
C. Cartier, R. Durrer, E. J. Copeland
We investigate both analytically and numerically the evolution of scalar perturbations generated in models which exhibit a smooth transition from a contracting to an expanding Frie…
Relic gravitons from non-singular string cosmologies
Cyril Cartier
In the context of the pre-Big Bang scenario of string cosmology, we propose a modified equation for the evolution of the tensor perturbations, which includes the full contribution…
The graceful exit in pre-big bang string cosmology
C. Cartier, E. J. Copeland, R. Madden
We re-examine the graceful exit problem in the pre-big bang scenario of string cosmology, by considering the most general time-dependent classical correction to the Lagrangian with…