Gravitational waves from rapid structure formation on microscopic scales before matter-radiation equality

Marcos M. Flores, Alexander Kusenko, Misao Sasaki

Submitted on 11 September 2022


The existence of scalar fields can be probed by observations of stochastic gravitational waves. Scalar fields mediate attractive forces, usually stronger than gravity, on the length scales shorter than their Compton wavelengths, which can be non-negligible in the early universe, when the horizon size is small. These attractive forces exhibit an instability similar to the gravitational instability, only stronger. They can, therefore, lead to the growth of structures in some species. We identify a gravitational waves signature of such processes and show that it can be detected by the future gravitational waves experiments.


Comment: 7 pages, 1 figure

Subjects: Astrophysics - Cosmology and Nongalactic Astrophysics; General Relativity and Quantum Cosmology; High Energy Physics - Phenomenology