Journal
PHYSICAL REVIEW D
Volume 84, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.84.124002
Keywords
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Funding
- NSF [PHY-0925345, PHY-0941417, PHY-0903973, TG-PHY060013N, PHY-0970074]
- Center for Relativistic Astrophysics. R. O. S.
- Bradley Program
- UWM Research Growth Initiative
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Previous studies have demonstrated that gravitational radiation reliably encodes information about the natural emission direction of the source (e. g., the orbital plane). In this paper, we demonstrate that these orientations can be efficiently estimated by the principal axes of < L(aLb)>,an average of the action of rotation group generators on the Weyl tensor at asymptotic infinity. Evaluating this average at each time provides the instantaneous emission direction. Further averaging across the entire signal yields an average orientation, closely connected to the angular components of the Fisher matrix. The latter direction is well-suited to data analysis and parameter estimation when the instantaneous emission direction evolves significantly. Finally, in the time domain, the average < L(aLb)> provides fast, invariant diagnostics of waveform quality.
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