Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2008-08-06
Phys.Rev.D79:084011,2009
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
26 pages, 14 figures, Published in Phys.Rev.D79:084011,2009
Scientific paper
10.1103/PhysRevD.79.084011
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.
Babiuc Maria Cristina
Bishop Nigel T.
Szilagyi Bela
Winicour Jeffrey
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