Astronomy and Astrophysics Seminars
Gravitational radiation captures of two black holes
by Prof. Gungwon Kang (KISTI, South Korea)
Monday, February 1, 2016
from
to
(Asia/Kolkata)
at TIFR ( DAA SEMINAR ROOM A269 )
at TIFR ( DAA SEMINAR ROOM A269 )
Description |
We have investigated gravitational radiation capturing processes of two black holes in weakly hyperbolic orbits (e.g., eccentricities of 1.0 ~ 1.4) by solving Einstein equations numerically. In the presence of a supermassive black hole in galactic nuclei, fully general relativistic understandings of such dynamical capturing processes become important to the formation of black hole binaries. We find that most of gravitational wave emissions occur when two black holes encounter closely. This explains why the multipole contributions higher than l=2 are negligible (e.g., about 1%) even if the orbit is quite eccentric or non-quasi-circular. The capturing cross section has been compared with the corresponding 2.5 post Newtonian results. They agree well for small initial energies, but differ up to about 40% for large initial energies. We also analyzed the features of energy and angular momentum radiations and gravitational wave forms for various masses and spin configurations. |