Non-Gaussianity and gravitational wave background in curvaton with a double well potential

Journal Article · Mon Nov 15 00:00:00 EST 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.82.103519· OSTI ID:21503607

Choi, Ki-Young; Seto, Osamu ^[1]

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1. Department of Physics, Pusan National University, Busan 609-735 (Korea, Republic of)

We study the density perturbation by a curvaton with a double well potential and give analytical expressions for the observables such as nonlinear parameters f{sub NL}, g{sub NL} and tensor-to-scalar ratio r{sub T} with emphasizing the differences from the simple quadratic potential. We show that the level of non-Gaussianity and the tensor-to-scalar ratio depends crucially on the reheating temperature as well as the curvaton self-coupling constant for a given initial amplitude of the curvaton. We find that for a large initial field the nonlinear parameters f{sub NL} can be 10-20 and the gravitational wave background also is observable in the Planck satellite.

• OSTI ID: 21503607
• Journal Information: Physical Review. D, Particles Fields, Vol. 82, Issue 10; Other Information: DOI: 10.1103/PhysRevD.82.103519; (c) 2010 American Institute of Physics; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMPLITUDES
COUPLING CONSTANTS
DENSITY
DISTURBANCES
GRAVITATIONAL WAVES
NONLINEAR PROBLEMS
PERTURBATION THEORY
PHYSICAL PROPERTIES