Dr. Weihua Lei (Huazhong Univ. of Science and Technology, China) visit our group and give colloquium speech

Oct 1, 2010

The central engine of gamma-ray bursts: Blandford-Znajek Process and neutrino-antineutrino annihilation”

The nature of the central engine of gamma-ray bursts (GRBs) has been one of the main puzzles of astrophysics, which is widely believed to be related to the merger of two neutron stars, the merger of neutron star and black hole, or the collapse of a supermassive star. All of these scenarios involve a rotating black hole with a hyper accretion disk or torus, from which energy is extracted for powering GRBs by neutrino-antineutrino annihilation or by extracting rotational energy from the black hole or disk via large scale magnetic field.

Here I will introduce a series of work I had done on these mechanisms, and give special emphasis to the Blandford-Znajek process. By using these mechanisms, we explained the basic properties of GRBs such as total energy, duration and lightcurves, as well as the production of X-ray flares after the GRB prompt emission.