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7 papers · 2 filters
Hybrid inflation with running inflaton mass
Laura Covi
We realize and study a model of hybrid inflation in the context of softly broken supersymmetry. The inflaton is taken to be a flat direction in the superfield space and, due to uns…
Quintessential Difficulties
Christopher Kolda, David H. Lyth
An alternative to a cosmological constant is quintessence, defined as a slowly-varying scalar field potential V(ϕ). If quintessence is observationally significant, an epoch of infl…
Running-mass models of inflation, and their observational constraints
Laura Covi, David H. Lyth
If the inflaton sector is described by softly broken supersymmetry, and the inflaton has unsuppressed couplings, the inflaton mass will run strongly with scale. Four types of model…
Inflation with TeV-scale gravity
David H Lyth
Allowing for the possibility of large extra dimensions, the fundamental Planck scale could be anywhere in the range $\TeV\lsim M\lsim \mpl$, where $\mpl=2.4\times 10^{18}\GeV$…
Observational constraints on an inflation model with a running mass
Laura Covi, David H. Lyth, Leszek Roszkowski
We explore a model of inflation where the inflaton mass-squared is generated at a high scale by gravity-mediated soft supersymmetry breaking, and runs at lower scales to the small…
Particle Physics Models of Inflation and the Cosmological Density Perturbation
David H. Lyth, Antonio Riotto
This is a review of particle-theory models of inflation, and of their predictions for the primordial density perturbation that is thought to be the origin of structure in the Unive…