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Observational constraints on models of inflation from the density perturbation and gravitino production
David H. Lyth
Present data require a spectral index $n\gsim 0.95$ at something like 1- level. If this lower bound survives it will constrain `new' and `modular' inflation models, while raisin…
Gravitino creation by an oscillating scalar field
David H. Lyth, Hang Bae Kim
This paper has been withdrawn because the analytic estimates are not confirmed by the numerical calculation of Nilles, Peloso and Sorbo (hep-ph/0102264 and hep-th/0103202).
Cosmological constraints on a Peccei-Quinn flatino as the lightest supersymmetric particle
Eung Jin Chun, Hang Bae Kim, David H. Lyth
In an interesting class of models, non-renormalizable terms of the superpotential are responsible for the spontanteous breaking of Peccei-Quinn (PQ) symmetry as well as the generat…
The abundance of relativistic axions in a flaton model of Peccei-Quinn symmetry
Eung Jin Chun, Denis Comelli, David H. Lyth
Flaton models of Peccei-Quinn symmetry have good particle physics motivation, and are likely to cause thermal inflation leading to a well-defined cosmology. They can solve the …
Global fits for the spectral index of the cosmological curvature perturbation
L. Covi, D. H. Lyth
Best-fit values of the spectral index of the curvature perturbation are presented, assuming the CDM cosmology. Apart from the spectral index, the parameters are the Hubble param…
Current Issues for Inflation
D. H. Lyth
Brief review of some current topics, including gravitino creation and large extra dimensions.
A new approach to the evolution of cosmological perturbations on large scales
David Wands, Karim A. Malik, David H. Lyth +1
We discuss the evolution of linear perturbations about a Friedmann-Robertson-Walker background metric, using only the local conservation of energy-momentum. We show that on suffici…
Observational constraints on the spectral index of the cosmological curvature perturbation
David H. Lyth, Laura Covi
We evaluate the observational constraints on the spectral index , in the context of the CDM hypothesis which represents the simplest viable cosmology. We first take to be…
Late-time creation of gravitinos from the vacuum
David H Lyth
Starting with the vacuum fluctuation, it is known that gravitinos will be created just after inflation, with number density where is the mass of the inflaton.…