Malaise and remedy of binary boson-star initial data
arXiv:2108.11995 · doi:10.1088/1361-6382/ac53b7
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.
28 pages, 9 figures, submitted to Classical Quantum Gravity
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- Unequal-mass boson-star binaries: Initial data and merger dynamics
- Gravitational wave constraints on extended dark matter structures
- Local Continuity of Angular Momentum and Noether Charge for Matter in General Relativity
- Piercing of a boson star by a black hole