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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
physics and astronomy
Characteristic initial data for a star orbiting a black hole
Physical Review D - Particles, Fields, Gravitation and Cosmology, Volume 72, No. 2, Article 024002, Year 2005
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Description
We take further steps in the development of the characteristic approach to enable handling the physical problem of a compact self-gravitating object, such as a neutron star, in close orbit around a black hole. We examine different options for setting the initial data for this problem and, in order to shed light on their physical relevance, we carry out short time evolution of this data. To this end we express the matter part of the characteristic gravity code so that the hydrodynamics are in conservation form. The resulting gravity plus matter relativity code provides a starting point for more refined future efforts at longer term evolution. In the present work we find that, independently of the details of the initial gravitational data, the system quickly flushes out spurious gravitational radiation and relaxes to a quasiequilibrium state with an approximate helical symmetry corresponding to the circular orbit of the star. © 2005 The American Physical Society.
Authors & Co-Authors
Bishop, Nigel T.
South Africa, Pretoria
University of South Africa
Gómez, Roberto
United States, Pittsburgh
Pittsburgh Supercomputing Center
United States, Pittsburgh
University of Pittsburgh
Lehner, Luis R.
United States, Baton Rouge
Louisiana State University
Maharaj, Manoj Sewak
South Africa, Durban
University of Kwazulu-natal
Winicour, Jeffrey H.
United States, Pittsburgh
University of Pittsburgh
Germany, Potsdam
Max-planck-institut Für Gravitationsphysik Albert-einstein-institut
Statistics
Citations: 19
Authors: 5
Affiliations: 6
Identifiers
Doi:
10.1103/PhysRevD.72.024002
ISSN:
15507998
e-ISSN:
15502368
Research Areas
Cancer