Speaker
Description
Abstract: We study the properties of the neutrino-dominated accretion flow (NDAF) around the rotating black holes. The accretion flow of this kind involves hyper-accretion rate (${\dot m} \sim 0.001-10$ $M_\odot~{\rm s}^{-1}$) and because of this, the disk becomes geometrically as well as optically thick that makes it difficult for photons to escape. On the contrary, neutrinos easily move out the disk resulting the cooling of the flow via radiative emissions and annihilation processes. Considering all these, we self-consistently solve the governing equations to obtain the global transonic shocked accretion solutions and compute the maximum neutrino luminosity, $L^{\rm max}_{\rm{\nu}}$ and neutrino annihilation luminosity, $L^{\rm max}_{\nu \, \bar{\nu}}$ for shocked accretion solutions for black holes of different spin value ($a_{\rm k}$). Furthermore, we compare $L_{\nu \, \bar{\nu}}$ with the observed output power $\dot{E}$ of Gamma-Ray Burst (GRB) sources for a wide range of mass accretion rate and spin of BH and find good agreement. With this, we perceive that the neutrino-dominated shocked accretion solutions seem potentially viable to account for the energy budget of the central engine of GRBs.
| kamit@iitg.ac.in | |
| Affiliation | Indian Institute of Technology Guwahati |
