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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This paper has been withdrawn because the analytic estimates are not confirmed by the numerical calculation of Nilles, Peloso and Sorbo (hep-ph/0102264 and hep-th/0103202).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 …
Current Issues for Inflation
D. H. Lyth
Brief review of some current topics, including gravitino creation and large extra dimensions.
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.…