Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2010-11-12
Phys.Rev.D83:043007,2011
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
30 pages, 21 figures
Scientific paper
10.1103/PhysRevD.83.043007
Self-gravitating relativistic disks around black holes can form as transient structures in a number of astrophysical scenarios such as binary neutron star and black hole-neutron star coalescences, as well as the core-collapse of massive stars. We explore the stability of such disks against runaway and non-axisymmetric instabilities using three-dimensional hydrodynamics simulations in full general relativity using the THOR code. We model the disk matter using the ideal fluid approximation with a $\Gamma$-law equation of state with $\Gamma=4/3$. We explore three disk models around non-rotating black holes with disk-to-black hole mass ratios of 0.24, 0.17 and 0.11. Due to metric blending in our initial data, all of our initial models contain an initial axisymmetric perturbation which induces radial disk oscillations. Despite these oscillations, our models do not develop the runaway instability during the first several orbital periods. Instead, all of the models develop unstable non-axisymmetric modes on a dynamical timescale. We observe two distinct types of instabilities: the Papaloizou-Pringle and the so-called intermediate type instabilities. The development of the non-axisymmetric mode with azimuthal number m = 1 is accompanied by an outspiraling motion of the black hole, which significantly amplifies the growth rate of the m = 1 mode in some cases. Overall, our simulations show that the properties of the unstable non-axisymmetric modes in our disk models are qualitatively similar to those in Newtonian theory.
Abdikamalov Ernazar B.
Korobkin Oleg
Schnetter Erik
Stergioulas Nikolaos
Zink Burkhard
No associations
LandOfFree
Stability of general-relativistic accretion disks does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Stability of general-relativistic accretion disks, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Stability of general-relativistic accretion disks will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-204864