1.5k citations · 22.2k across the 177 of their papers we have counts for
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Large-scale curvature and entropy perturbations for multiple interacting fluids
Karim A. Malik, David Wands, Carlo Ungarelli
We present a gauge-invariant formalism to study the evolution of curvature perturbations in a Friedmann-Robertson-Walker universe filled by multiple interacting fluids. We resolve…
The primordial density perturbation in the curvaton scenario
David H. Lyth, Carlo Ungarelli, David Wands
We analyse the primordial density perturbation when it is generated by a `curvaton' field different from the inflaton. In some cases this perturbation may have large isocurvature c…
Cosmology with positive and negative exponential potentials
Imogen P. C. Heard, David Wands
We present a phase-plane analysis of cosmologies containing a scalar field with an exponential potential where and may be positive or neg…
An Observational Test of Two-field Inflation
David Wands, Nicola Bartolo, Sabino Matarrese +1
We study adiabatic and isocurvature perturbation spectra produced by a period of cosmological inflation driven by two scalar fields. We show that there exists a model-independent c…
String-inspired cosmology
David Wands
I discuss cosmological models either derived from, or inspired by, string theory or M-theory. In particular I discuss solutions in the low-energy effective theory and the role of t…
Primordial perturbations from inflation
David Wands
I review the standard analysis of adiabatic scalar and tensor perturbations produced by slow-roll inflation driven by a single scalar field, before going on to discuss recent work…