Work

Squeezed primordial bispectrum from a general vacuum state

Year: 2013

Type: article

Abstract: We study the general relation between the power spectrum and the squeezed limit of the bispectrum of the comoving curvature perturbation produced during single-field slow-roll inflation when the initial state is a general vacuum. Assuming the scale invariance of the power spectrum, we derive a formula for the squeezed limit of the bispectrum, represented by the parameter f NL , which is not slow-roll suppressed and is found to contain a single free parameter for a given amplitude of the power spectrum. Then, we derive the conditions for achieving a scale-invariant f NL and discuss a few examples.

Source: Classical and Quantum Gravity

DOI: 10.1088/0264-9381/30/9/095005

Authors: Jinn-Ouk Gong, Misao Sasaki

Institutions: Pohang University of Science and Technology, Asia Pacific Center for Theoretical Physics, Kyoto University, Yukawa Institute for Theoretical Physics

Language: English

Topic: Cosmology and Gravitation Theories

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: bronze

Funders: Ministry of Education, Science and Technology, Max-Planck-Gesellschaft, Japan Society for the Promotion of Science

Award: research on cosmological nonlinear and non-perturbative gravitational phenomena