Work

Non-Gaussianity from attractor curvaton

Year: 2013

Type: article

Abstract: We propose a curvaton model in which the initial condition of the curvaton oscillation is determined by its attractor behavior during inflation. Assuming a chaotic inflation model, we find that the initial condition determined by the attractor behavior is appropriate to generate a sizable non-Gaussianity contribution to the curvature perturbation, which will be tested in the foreseeable future. Implications on the thermal history of the Universe and on particle physics models are also discussed.

Source: Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields

DOI: 10.1103/physrevd.87.063514

Authors: Keisuke Harigaya, Masahiro Ibe, Masahiro Kawasaki, Tsutomu T. Yanagida

Institutions: Kavli Institute for the Physics and Mathematics of the Universe, The University of Tokyo, Institute for Cosmic Ray Research

Language: English

Topic: Cosmology and Gravitation Theories

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funder: Japan Society for the Promotion of Science

Awards: Study on evolution of scalar fields in the early universe and its observational consequences, G5473262123, Origin of matter and its fluctuation in the inflationary universe