Abstract Details
| Name: Soumen Mondal Affiliation: Jadavpur University Conference ID: ASI2017_1348 Title : Gravitational wave emission during the coalescence of the black holes in a binary system in the presence of an accretion disc. Authors and Co-Authors : Prasad Basu, Cotton College State University, Guwahati, Assam. and Sandip K. Chakrabarti, S. N. Bose National Centre For Basic sciences, Kolkata. Abstract Type : Poster Abstract Category : General Relativity and Cosmology Abstract : Gravitational wave signal characteristics from a binary black hole system in which the companion moves through the accretion disc of the primary are studied. We chose the primary to be a super-massive (M=10^8MSun)Kerr black hole and the companion to be a massive black hole(M=10^5 MSun)to clearly demonstrate the effects. We show that the drag exerted on the companion by the disc is sufficient to reduce the coalescence time of the binary. The drag is rimarily due to the fact that the accretion disc on a black hole deviates from a Keplerian disc and becomes sub-Keplerian due to inner boundary condition on the black hole horizon. Here, we considered two types of accretion rates on to the companion- (i) Bondi accretion and (ii) Eddington accretion,when the companion is deeply immersed inside the disc. These two cases are studied and the results are compared. We arrived at a few important conclusions: (a) the coalescence takes lesser time if the central black hole is Kerr type than a Schwarzschild type. (b)When the accretion rate on to the companion is high, the effect of the drag is also high.As a consequence, the gravitational wave emission profile is modified. Our results clearly indicated that the interpretation of the data from the future gravitational wave detectors should be done more carefully. |