Physics
Scientific paper
Mar 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aipc..751..221n&link_type=abstract
GENERAL RELATIVITY AND GRAVITATIONAL PHYSICS: 16th SIGRAV Conference on General Relativity and Gravitational Physics. AIP Confe
Physics
1
Black Holes, Physics Of Black Holes, Relativity And Gravitation
Scientific paper
We discuss recent results concerning the gravitational wave (GW) emission from matter accretion onto a Schwarzschild black hole. A numerical ``hybrid'' procedure is adopted in which the dynamics of the accreting matter is studied by solving, in axisymmetry (m = 0), the non-linear general relativistic equations of fluid dynamics using a code based on high-resolution-shock-capturing (HRSC) methods; the GW signal is correspondingly obtained as a solution of the inhomogeneous odd-and even-parity equations of linearized metric perturbations of Schwarzschild spacetime (i.e., Regge-Wheeler and Zerilli-Moncrief equations). Self-gravity of the accreting matter and radiation-reaction effects are neglected. Different configurations are considered: i) quadrupolar dust shells; ii) runaway unstable thick accretion disks and iii) oscillations of (stable) thick disks.
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