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Curvature and isocurvature perturbations in a three-fluid model of curvaton decay
Sujata Gupta, Karim A. Malik, David Wands
We study the evolution of the cosmological perturbations after inflation in curvaton models where the non-relativistic curvaton decays into both radiation and a cold dark matter co…
Evolution of gravitational waves in Randall-Sundrum cosmology
Richard Easther, David Langlois, Roy Maartens +1
We investigate the evolution of gravitational wave perturbations about a brane cosmology embedded in a five-dimensional anti-de Sitter bulk. During slow-roll inflation in a Randall…
Evolution of second-order cosmological perturbations
Karim A Malik, David Wands
We present a method for constructing gauge-invariant cosmological perturbations which are gauge-invariant up to second order. As an example we give the gauge-invariant definition o…
Inflationary parameters and primordial perturbation spectra
David Wands
I discuss how parameters describing inflation in the very early universe may be related to primordial perturbation spectra. Precision observations of anisotropies in the cosmic mic…
The CDM isocurvature perturbation in the curvaton scenario
David H Lyth, David Wands
We discuss the residual isocurvature perturbations, fully-correlated with the curvature perturbation, that are automatic in the curvaton scenario if curvaton decay is sufficiently…
Conserved cosmological perturbations
David H Lyth, David Wands
A conserved cosmological perturbation is associated with each quantity whose local evolution is determined entirely by the local expansion of the Universe. It may be defined as the…