Gravitational Wave Symphony from Oscillating Spectator Scalar Fields
Abstract
We investigate a generic source of stochastic gravitational wave background due to the parametric resonance of oscillating scalar fields in the early Universe. By systematically analyzing benchmark models through lattice simulations and considering a wide range of parameters, we demonstrate that such a scenario can lead to detectable signals in gravitational wave detectors over a broad frequency range and potentially address the recent findings by pulsar timing array experiments. Furthermore, these models naturally yield ultralight dark matter candidates or dark radiation detectable by cosmic microwave background observatories.
Cite
@article{arxiv.2310.13060,
title = {Gravitational Wave Symphony from Oscillating Spectator Scalar Fields},
author = {Yanou Cui and Pankaj Saha and Evangelos I. Sfakianakis},
journal= {arXiv preprint arXiv:2310.13060},
year = {2024}
}
Comments
15 pages, 3 figs including supplemental material, minor revisions, version accepted for publication in Physical Review Letters