Non-gaussianity with Lagrange multiplier field in the curvaton scenario

Journal Article · Fri Oct 01 00:00:00 EDT 2010 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2010/10/027· OSTI ID:22275357

Feng, Chao-Jun; Li, Xin-Zhou ^[1]

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1. Shanghai United Center for Astrophysics (SUCA), Shanghai Normal University, 100 Guilin Road, Shanghai 200234, P.R.China (China)

In this paper, we will use δN-formalism to calculate the primordial curvature perturbation for the curvaton model with a Lagrange multiplier field. We calculate the non-linearity parameters f{sub NL} and g{sub NL} in the sudden-decay approximation in this kind of model, and we find that one could get a large non-Gaussinity even if the curvaton dominates the total energy density before it decays, and this property will make the curvaton model much richer. We also calculate the probability density function of the primordial curvature perturbation in the sudden-decay approximation, as well as some moments of it.

• OSTI ID: 22275357
• Journal Information: Journal of Cosmology and Astroparticle Physics, Vol. 2010, Issue 10; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
APPROXIMATIONS
COSMOLOGICAL MODELS
COSMOLOGY
DECAY
DISTURBANCES
ENERGY DENSITY
PROBABILITY DENSITY FUNCTIONS