How well do we know the scalar-induced gravitational waves?
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.
Authors
- S. Matarrese (ORCID: https://orcid.org/0000-0002-2573-1243)
- Antonio J. Iovino (ORCID: https://orcid.org/0000-0002-8531-5962)
- Angelo Ricciardone (ORCID: https://orcid.org/0000-0002-5688-455X)
- Antonio Walter Riotto (ORCID: https://orcid.org/0000-0001-6948-0856)
- G. Perna (ORCID: https://orcid.org/0000-0002-7364-1904)
Institutions
- University of Geneva (CH)
- University of Padua (IT)
- Istituto Nazionale di Fisica Nucleare, Galileo Galilei Institute for Theoretical Physics (IT)
- Istituto Nazionale di Fisica Nucleare, Sezione di Padova (IT)
- Gran Sasso Science Institute (IT)
- Istituto Nazionale di Fisica Nucleare, Sezione di Roma I (IT)
- Osservatorio Astronomico di Padova (IT)
- Istituto Nazionale di Fisica Nucleare, Sezione di Pisa (IT)
- Sapienza University of Rome (IT)
Publication Details
- Journal
- Physics Letters B
- Published
- 2025-11-27
- DOI
- https://doi.org/10.1016/j.physletb.2025.140039
- Citations
- 5
- Primary Topic
- Cosmology and Gravitation Theories
- Type
- article
- Field-Weighted Citation Impact
- 5.77