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9 papers · 2 filters
Super-horizon perturbations and preheating
Andrew R. Liddle, David H. Lyth, Karim A. Malik +1
It has recently been claimed by Bassett et al that preheating after inflation may affect the amplitude of curvature perturbations on large scales, undermining the usual inflationar…
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…
Axinos as Cold Dark Matter
Laura Covi, Jihn E. Kim, Leszek Roszkowski
We show that axinos produced in the early Universe in the decay of the lightest neutralinos are a natural candidate for cold dark matter. We argue that axinos may well provide the…
WIMP Velocity Impact on Direct Dark Matter Searches
Michal Brhlik, Leszek Roszkowski
We examine the effect of some uncertainties in the input astrophysical parameters on direct detection searches for WIMPs in the Galactic halo. We concentrate on the possible WIMP a…