Malaise and remedy of binary boson-star initial data

Kavli Affiliate: Ulrich Sperhake

| First 5 Authors: Thomas Helfer, Ulrich Sperhake, Robin Croft, Miren Radia, Bo-Xuan Ge

| Summary:

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.

| Search Query: ArXiv Query: search_query=au:”Ulrich Sperhake”&id_list=&start=0&max_results=10

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