We study gravitational waves generated by bubble expansion created during the Cosmological Electroweak Phase Transition (EWPT). The energy radiated via gravitational waves is produced by the stress-energy tensor created by the magnetic field produced by bubble collisions during the EWPT, which occured about 10−11 seconds after the Big Bang.
@article{arxiv.2006.11257,
title = {Gravitational Waves Created During the EWPT},
author = {Leonard S. Kisslinger},
journal= {arXiv preprint arXiv:2006.11257},
year = {2020}
}