Curvaton and the inhomogeneous end of inflation

We study the primordial density perturbations and non-Gaussianities generated from the combined effects of an inhomogeneous end of inflation and curvaton decay in hybrid inflation. This dual role is played by a single isocurvature field which is massless during inflation but acquire a mass at the en...

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Bibliographic Details
Published in:Journal of cosmology and astroparticle physics 2012-12, Vol.2012 (12), p.1-18, Article 024
Main Authors: Assadullahi, Hooshyar, Firouzjahi, Hassan, Namjoo, Mohammad Hossein, Wands, David
Format: Article
Language:English
Subjects:
ASTROPHYSICS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
COSMOLOGY
Decay
DENSITY
Inflation
INFLATIONARY UNIVERSE
INFLATONS
MASSLESS PARTICLES
Mathematical analysis
Nonlinearity
PARTICLE DECAY
Perturbation methods
PERTURBATION THEORY
PHASE TRANSFORMATIONS
Recovering
REST MASS
Waterfalls
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Summary:We study the primordial density perturbations and non-Gaussianities generated from the combined effects of an inhomogeneous end of inflation and curvaton decay in hybrid inflation. This dual role is played by a single isocurvature field which is massless during inflation but acquire a mass at the end of inflation via the waterfall phase transition. We calculate the resulting primordial non-Gaussianity characterized by the non-linearity parameter, f sub(NL), recovering the usual end-of-inflation result when the field decays promptly and the usual curvaton result if the field decays sufficiently late.
ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2012/12/024