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The gravitino abundance in supersymmetric `new' inflation models
David H Lyth
We consider the abundance of gravitinos created from the vacuum fluctuation, in a class of `new' inflation models for which global supersymmetry is a good approximation. Immediatel…
The abundance of moduli, modulini and gravitinos produced by the vacuum fluctuation
David H. Lyth
Moduli, modulini and the gravitino have gravitational-strength interactions, and thermal collisions after reheating create all of them with roughly the same abundance. With their m…
Constraints on TeV-scale hybrid inflation and comments on non-hybrid alternatives
David H Lyth
During hybrid inflation, the slowly-rolling inflaton field has a significant coupling to the trigger field which is responsible for most of the potential. Barring a fine-tuned acci…
The parameter space for tree-level hybrid inflation
David H. Lyth
In a large region of parameter space, the tree-level hybrid inflation model is likely to be be invalidated by loop corrections. In particular, this is likely to be the case if both…
Flatons and Peccei-Quinn Symmetry
E. J. Chun, D. Comelli, David H. Lyth
We study in detail a supersymmetric Peccei-Quinn model, which has a DFSZ and a KSVZ version. The fields breaking the Peccei-Quinn (PQ) symmetry correspond to flat directions (flato…
Models of inflation and their predictions
David H Lyth
Taking field theory seriously, inflation model-building is difficult but not impossible. The observed value of the spectral index of the adiabatic density perturbation is starting…