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New Constraints on the running-mass inflation model
Laura Covi, David H. Lyth, Alessandro Melchiorri
We evaluate new observational constraints on the two-parameter scale-dependent spectral index predicted by the running-mass inflation model by combining the latest Cosmic Microwave…
Models of inflation liberated by the curvaton hypothesis
Konstantinos Dimopoulos, David H. Lyth
It is usually supposed that inflation is of the slow-roll variety, and that the inflaton generates the primordial curvature perturbation. According to the curvaton hypothesis, infl…
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…
Generating the primordial curvature perturbation from inflation
David H. Lyth
The scale--independence of the primordial curvature perturbation suggests that it comes from the vacuum fluctuation during inflation of a light scalar field. This field may be the…