S E M I N A R IDepartament d'Astronomia i Astrofísica
Universitat de València
New approach to calculating the News
Shrirang S. Deshingkar
Department of Mathematics, Applied Mathematics and Astronomy, University of South Africa, Pretoria
Seminari del departament d'Astronomia i Astrofísica
Dijous 02 octubre 2003
We consider the problem of finding the gravitational radiation output, or news, within the context of a numerical simulation of a spacetime by means of the null-cone, or characteristic, approach to numerical relativity. We develop a method for computing the news that uses an explicit coordinate transformation to a coordinate system that satisfies the Bondi conditions. The method has been implemented computationally. We present results of applying the method to certain test problems, demonstrating second order convergence of the news to the analytic value. We report some recent progress in generalizing the work and using it with numerically evolved spacetimes.