Malaise and remedy of binary boson-star initial data

Thomas Helfer, Ulrich Sperhake*, Robin Croft, Miren Radia, Bo-Xuan Ge, Eugene A. Lim

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)
24 Downloads (Pure)


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. For equal-mass binaries, these difficulties can be overcome with a simple modification of the initial data suggested in Helfer et al (2019 Phys. Rev. D 99 044046) for collisions of oscillations. While we specifically consider massive complex scalar field boson star models of very high and low compactness, we conjecture that this vulnerability be also present in other kinds of exotic compact systems and hence needs to be addressed.

Original languageEnglish
Article number074001
JournalClassical and Quantum Gravity
Issue number7
Publication statusPublished - 11 Mar 2022


  • boson stars
  • compact objects
  • gravitational waves
  • numerical relativity


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