Efficient simulations of high-spin black holes with a new gauge

Creators: Chen, Yitian; Deppe, Nils; Kidder, Lawrence E.; Teukolsky, Saul A.

Abstract

We present a new choice of initial data for binary black hole simulations that significantly improves the efficiency of high-spin simulations. We use spherical Kerr-Schild coordinates, where the horizon of a rotating black hole is spherical, for each black hole. The superposed spherical Kerr-Schild initial data reduce the runtime by a factor of 2 compared to standard superposed Kerr-Schild for an intermediate resolution spin-0.99 binary-black-hole simulation. We also explore different variations of the gauge conditions imposed during the evolution, one of which produces an additional speed-up of 1.3.

Additional Information

© 2021 American Physical Society. (Received 6 August 2021; accepted 21 September 2021; published 12 October 2021) We thank Michael Boyle, Dante Iozzo, and Vijay Varma for useful discussions. Computations were performed with the High Performance Computing Center and the Wheeler cluster at Caltech. Computations were also conducted on the Frontera computing project at the Texas Advanced Computing Center. This work was supported in part by the Sherman Fairchild Foundation and by NSF Grants No. PHY-2011961, No. PHY-2011968, and No. OAC-1931266 at Caltech, and NSF Grants No. PHY-1912081 and No. OAC-1931280 at Cornell.

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Published - PhysRevD.104.084046.pdf

Submitted - 2108.02331.pdf

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