How well do we know the scalar-induced gravitational waves?
Year: 2025
Type: article
Abstract: Gravitational waves sourced by amplified scalar perturbations are a common prediction across a wide range of cosmological models. These scalar curvature fluctuations are inherently nonlinear and typically non-Gaussian. We argue that the effects of non-Gaussianity may not always be adequately captured by an expansion around a Gaussian field, expressed through nonlinear parameters such as f NL . As a consequence, the resulting amplitude of the stochastic gravitational wave background may differ significantly from predictions based on the standard quadratic source model routinely used in the literature.
Source: Physics Letters B
Institutions: University of Geneva, Istituto Nazionale di Fisica Nucleare, Sezione di Roma I, Sapienza University of Rome, University of Padua, Istituto Nazionale di Fisica Nucleare, Sezione di Padova, Gran Sasso Science Institute, Osservatorio Astronomico di Padova, National Institute for Astrophysics, University of Pisa, Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W4416767628