Parametric resonance of gravitational waves in general scalar-tensor theories

verfasst von
Yi Fu Cai, Guillem Domènech, Alexander Ganz, Jie Jiang, Chunshan Lin, Bo Wang
Abstract

Gravitational waves offer a potent mean to test the underlying theory of gravity. In general theories of gravity, such as scalar-tensor theories, one expects modifications in the friction term and the sound speed in the gravitational wave equation. In that case, rapid oscillations in such coefficients, e.g. due to an oscillating scalar field, may lead to narrow parametric resonances in the gravitational wave strain. We perform a general analysis of such possibility within DHOST theories. We use disformal transformations to find the theory space with larger resonances, within an effective field theory approach. We then apply our formalism to a non-minimally coupled ultra-light dark matter scalar field, assuming the presence of a primordial gravitational wave background, e.g., from inflation. We find that the resonant peaks in the spectral density may be detectable by forthcoming detectors such as LISA, Taiji, Einstein Telescope and Cosmic Explorer.

Organisationseinheit(en)
Institut für Theoretische Physik
Fakultät für Mathematik und Physik
Externe Organisation(en)
University of Science and Technology of China
Jagiellonian University
Pusan National University
Typ
Artikel
Journal
Journal of Cosmology and Astroparticle Physics
Band
2024
ISSN
1475-7516
Publikationsdatum
10.2024
Publikationsstatus
Veröffentlicht
Peer-reviewed
Ja
ASJC Scopus Sachgebiete
Astronomie und Astrophysik
Elektronische Version(en)
https://doi.org/10.48550/arXiv.2311.18546 (Zugang: Offen)
https://doi.org/10.1088/1475-7516/2024/10/027 (Zugang: Offen)