Work

Primordial non-Gaussianity in multiscalar inflation

Year: 2008

Type: article

Abstract: We give a concise formula for the non-Gaussianity of the primordial curvature perturbation generated on superhorizon scales in the multiscalar inflation model without assuming slow-roll conditions. This is an extension of our previous work. Using this formula, we study the generation of non-Gaussianity for the double inflation models in which the slow-roll conditions are temporarily violated after horizon exit, and we show that the nonlinear parameter ${f}_{\mathrm{NL}}$ for such models is suppressed by the slow-roll parameters evaluated at the time of horizon exit.

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

DOI: 10.1103/physrevd.77.083511

Authors: Shuichiro Yokoyama, Teruaki Suyama, Takahiro Tanaka

Institutions: Kyoto University, Institute for Cosmic Ray Research, The University of Tokyo

Language: English

Topic: Cosmology and Gravitation Theories

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: Ministry of Education, Culture, Sports, Science and Technology, Yukawa Institute for Theoretical Physics, Kyoto University

OpenAlex ID: W2161628068

FWCI: 5.188

Cites: 25

Cited by: 94

Related to: 10