Malaise and remedy of binary boson-star initial data
Abstract
Through numerical simulations of boson-star head-on collisions, we explore the quality of binary initial data obtained from the superposition of single-star spacetimes. Our results demonstrate that evolutions starting from a plain superposition of individual boosted boson-star spacetimes are vulnerable to significant unphysical artefacts. These difficulties can be overcome with a simple modification of the initial data suggested in [PRD 99 (2018) 044046] for collisions of oscillatons. While we specifically consider massive complex scalar field boson star models up to a 6th-order-polynomial potential, we argue that this vulnerability is universal and present in other kinds of exotic compact systems and hence needs to be addressed.
Keywords
Cite
@article{arxiv.2108.11995,
title = {Malaise and remedy of binary boson-star initial data},
author = {Thomas Helfer and Ulrich Sperhake and Robin Croft and Miren Radia and Bo-Xuan Ge and Eugene A. Lim},
journal= {arXiv preprint arXiv:2108.11995},
year = {2022}
}
Comments
28 pages, 9 figures, submitted to Classical Quantum Gravity