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          Institute: MPI für Gravitationsphysik     Collection: Astrophysical Relativity     Display Documents



ID: 441601.0, MPI für Gravitationsphysik / Astrophysical Relativity
Strategies for the Characteristic Extraction of Gravitational Waveforms
Authors:Babiuc, M. C.; Bishop, N. T.; Szilagyi, B.; Winicour, J.
Date of Publication (YYYY-MM-DD):2009
Title of Journal:Physical Review D
Volume:79
Sequence Number of Article:084011
Review Status:not specified
Audience:Not Specified
Abstract / Description: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.
External Publication Status:published
Document Type:Article
Communicated by:Bernhard F. Schutz
Affiliations:MPI für Gravitationsphysik/Astrophysical Relativity
Identifiers:LOCALID:arXiv:0808.0861
DOI:10.1103/PhysRevD.79.084011
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0808.0861v2.pdf  [2,00 Mb] [Comment:arXiv:0808.0861v2 [gr-qc]]  
 
PRD79_084011.pdf  [3,00 Mb] [Comment:Journal]  
 
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