Work

Non-Gaussianity from inflation

Year: 2002

Type: article

Abstract: Correlated adiabatic and isocurvature perturbation modes are produced during inflation through an oscillation mechanism when extra scalar degrees of freedom, other than the inflaton field, are present. We show that this correlation generically leads to sizable non-Gaussian features both in the adiabatic and isocurvature perturbations. The non-Gaussianity is first generated by large nonlinearities in some scalar sector and then efficiently transferred to the inflaton sector by the oscillation process. We compute the cosmic microwave background angular bispectrum, providing a characteristic feature of such inflationary non-Gaussianity, which might be detected by upcoming satellite experiments.

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

DOI: 10.1103/physrevd.65.103505

Authors: N. Bartolo, S. Matarrese, A. Riotto

Institutions: University of Padua, University of Sussex, Istituto Nazionale di Fisica Nucleare, Sezione di Padova

Language: English

Topic: Cosmology and Gravitation Theories

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

OpenAlex ID: W1977829527

FWCI: 11.53

Cites: 44

Cited by: 227

Related to: 10