Gauge Invariant Spectral Cauchy Characteristic Extraction

Abstract

We present gauge invariant spectral Cauchy characteristic extraction. We compare gravitational waveforms extracted from a head-on black hole merger simulated in two different gauges by two different codes. We show rapid convergence, demonstrating both gauge invariance of the extraction algorithm and consistency between the legacy Pitt null code and the much faster Spectral Einstein Code (SpEC).

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© 2015 IOP Publishing Ltd. Received 27 February 2015, revised 7 August 2015. Accepted for publication 6 October 2015. Published 17 November 2015. Submitted on 24 Feb 2015 (v1), last revised 7 Aug 2015 (this version, (v2) We thank Nicholas Taylor for his generic spinning binary black hole run that we used to test and baseline code performance. We thank Yosef Zlochower for supplying details of the news module in the Pitt null code. We thank Mark Scheel, Yanbei Chen, and Christian Reisswig for their advice, support, and technical expertise, and thank Michael Boyle for comments on the manuscript. This research used the Spectral Einstein Code (SpEC)[25]. The Caltech cluster zwicky.cacr.caltech.edu is an essential resource for SpEC related research, supported by the Sherman Fairchild Foundation and by NSF award PHY-0960291. This research also used the Extreme Science and Engineering Discovery Environment (XSEDE) under grant TG-PHY990002. The UCSD cluster ccom-boom.ucsd.edu was used during code development. This project was supported by the Sherman Fairchild Foundation, and by NSF Grants PHY-1068881, AST-1333520, and CAREER Grant PHY-0956189 at Caltech. JW's research was supported by NSF grant PHY-1201276 to the University of Pittsburgh.

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Submitted - 1502.06987v2.pdf

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