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Low scale inflation and the curvaton mechanism
Konstantinos Dimopoulos, David H. Lyth, Yeinzon Rodriguez
The primordial curvature perturbation may be due to a `curvaton' field, which dominates (or almost dominates) the energy density before it decays. In the simplest version of the cu…
A general proof of the conservation of the curvature perturbation
David H. Lyth, Karim A. Malik, Misao Sasaki
Without invoking a perturbative expansion, we define the cosmological curvature perturbation, and consider its behaviour assuming that the universe is smooth over a sufficiently la…
The running-mass inflation model and WMAP
Laura Covi, David H. Lyth, Alessandro Melchiorri +1
We consider the observational constraints on the running-mass inflationary model, and in particular on the scale-dependence of the spectral index, from the new Cosmic Microwave Bac…
Note about leptogenesis from gravity waves in models of inflation
David H. Lyth, Yeinzon Rodriguez, Carlos Quimbay
We show how the mechanism recently proposed by Alexander, Peskin, and Sheikh-Jabbari, in which the observed cosmic matter-antimatter asymmetry comes from the contribution of the co…
The masses of weakly-coupled scalar fields in the early Universe
David H. Lyth, Takeo Moroi
We consider the effective mass-squared in the early Universe, of a scalar field which has only Planck-suppressed couplings with light fields and whose true mass is less than the Hu…
Curvaton and QCD Axion in Supersymmetric Theories
Eung Jin Chun, Konstantinos Dimopoulos, David Lyth
A pseudo Nambu-Goldstone boson as curvaton avoids the eta-problem of inflation which plagues most curvaton candidates. We point out that a concrete realization of the curvaton mech…