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A-term inflation and the MSSM
J. C. Bueno Sanchez, K. Dimopoulos, David H. Lyth
The parameter space for A-term inflation is explored with . With p=6 and λ_p~1, the observed spectrum and spectral tilt can be obtained with soft mass of o…
Generating the Curvature Perturbation at the End of Inflation in String Theory
D. H. Lyth, A. Riotto
In brane inflationary scenarios, the cosmological perturbations are supposed to originate from the vacuum fluctuations of the inflaton field corresponding to the position of the br…
Classicality of the primordial perturbations
David H. Lyth, David Seery
We show that during inflation, a quantum fluctuation becomes classical at all orders if it becomes classical at first order. Implications are discussed.
MSSM inflation
David H. Lyth
Variants of the -term model of hep-ph/0605035 are considered. They are equally successful, indicating that the model is quite robust once the relation between and the soft m…
Curvature perturbation from symmetry breaking the end of inflation
Laila Alabidi, David Lyth
We consider a two-field hybrid inflation model, in which the curvature perturbation is predominantly generated at the end of inflation. By finely tuning the coupling of the fields…
A numerical study of non-gaussianity in the curvaton scenario
Karim A. Malik, David H. Lyth
We study the curvaton scenario using gauge-invariant second order perturbation theory and solving the governing equations numerically. Focusing on large scales we calculate the non…
Inflation models after WMAP year three
Laila Alabidi, David H. Lyth
The survey of models in astro-ph/0510441 is updated.For the first time, a large fraction of the models is ruled out at more than .
Non-gaussianity and cosmic uncertainty in curvaton-type models
D. H. Lyth
In curvaton-type models, observable non-gaussianity of the curvature perturbation would come from a contribution of the form , where is gaussian. I analyse this situat…
Higher order contributions to the primordial non-gaussianity
Ignacio Zaballa, Yeinzon Rodriguez, David H. Lyth
In this paper we calculate additional contributions to that part of the non-Gaussianity of the curvature perturbation, which come from the three-point correlator of the field pertu…