Inverse-chirp signals and spontaneous scalarisation with self-interacting potentials in stellar collapse
Abstract
We study how the gravitational wave signal from stellar collapse in scalar-tensor gravity varies under the influence of scalar self-interaction. To this end, we extract the gravitational radiation from numerical simulations of stellar collapse for a range of potentials with higher-order terms in addition to the quadratic mass term. Our study includes collapse to neutron stars and black holes and we find the strong inverse-chirp signals obtained for the purely quadratic potential to be exceptionally robust under changes in the potential at higher orders; quartic and sextic terms in the potential lead to noticeable differences in the wave signal only if their contribution is amplified, implying a relative fine-tuning to within 5 or more orders of magnitude between the mass and self-interaction parameters.
Keywords
Cite
@article{arxiv.1903.09704,
title = {Inverse-chirp signals and spontaneous scalarisation with self-interacting potentials in stellar collapse},
author = {Roxana Rosca-Mead and Christopher J Moore and Michalis Agathos and Ulrich Sperhake},
journal= {arXiv preprint arXiv:1903.09704},
year = {2019}
}
Comments
15 pages, 5 figures; submitted to CQG