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  Strategies for the Characteristic Extraction of Gravitational Waveforms

Babiuc, M. C., Bishop, N. T., Szilagyi, B., & Winicour, J. (2009). Strategies for the Characteristic Extraction of Gravitational Waveforms. Physical Review D, 79: 084011. doi:10.1103/PhysRevD.79.084011.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0012-648D-4 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0012-648F-F
Genre: Journal Article

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 Creators:
Babiuc, M. C.1, Author
Bishop, N. T.1, Author
Szilagyi, Bela2, Author              
Winicour, J.2, Author
Affiliations:
1External Organizations, ou_persistent22              
2Astrophysical Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, Golm, DE, ou_24013              

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 Abstract: We develop, test and compare new numerical and geometrical methods for improving the accuracy of extracting waveforms using characteristic evolution. The new numerical method involves use of circular boundaries to the stereographic grid patches which cover the spherical cross-sections of the outgoing null cones. We show how an angular version of numerical dissipation can be introduced into the characteristic code to damp the high frequency error arising form the irregular way the circular patch boundary cuts through the grid. The new geometric method involves use of the Weyl tensor component $\Psi_4$ to extract the waveform as opposed to the original approach via the Bondi news function. We develop the necessary analytic and computational formula to compute the $O(1/r)$ radiative part of $\Psi_4$ in terms of a conformally compactified treatment of null infinity. These methods are compared and calibrated in test problems based upon linearized waves.

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 Dates: 2009
 Publication Status: Published in print
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 Rev. Method: Peer
 Identifiers: eDoc: 441601
Other: arXiv:0808.0861
DOI: 10.1103/PhysRevD.79.084011
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Title: Physical Review D
Source Genre: Journal
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Pages: - Volume / Issue: 79 Sequence Number: 084011 Start / End Page: - Identifier: -