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Post-Newtonian freely specifiable initial data for binary black holes in numerical relativity

Samaya Nissanke*

  • GReCo—Gravitation et Cosmologie, Institut d’Astrophysique de Paris, C.N.R.S., 98 bis boulevard Arago, 75014 Paris, France

  • *Electronic address: nissanke@iap.fr
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Phys. Rev. D 73, 124002 – Published 2 June, 2006

DOI: https://doi.org/10.1103/PhysRevD.73.124002

Abstract

Construction of astrophysically realistic initial data remains a central problem when modelling the merger and eventual coalescence of binary black holes in numerical relativity. The objective of this paper is to provide astrophysically realistic freely specifiable initial data for binary black hole systems in numerical relativity, which are in agreement with post-Newtonian results. Following the approach taken by Blanchet [L. Blanchet, Phys. Rev. D 68, 084002 (2003).], we propose a particular solution to the time-asymmetric constraint equations, which represent a system of two moving black holes, in the form of the standard conformal decomposition of the spatial metric and the extrinsic curvature. The solution for the spatial metric is given in symmetric-trace-free form, as well as in Dirac coordinates. We show that the solution differs from the usual post-Newtonian metric up to the 2PN order by a coordinate transformation. In addition, the solutions, defined at every point of space, differ at second post-Newtonian order from the exact, conformally-flat, Bowen-York solution of the constraints.

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Phys. Rev. D 73, 124002– Published 2 June, 2006
  • Received 29 September 2005

© 2006 American Physical Society

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