Authors: R. O'Shaughnessy (1), B. Vaishnav (2), J. Healy (3), Z. Meeks (3), D. Shoemaker (3) ((1) University of Wisconsin, Milwaukee, (2) Georgia Southern University, (3) Center for Relativistic Astrophysics, Georgia Tech)
Date: 24 Sep 2011
Abstract: 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_a L_b>, 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_a L_b> provides fast, invariant diagnostics of waveform quality.
© M. Vallisneri 2012 — last modified on 2010/01/29
Tantum in modicis, quantum in maximis