Proposed source of gravitational radiation from a torus around a black hole - art. no. 091101

Long gamma-ray bursts (GRBs) could be emitted from rapidly spinning black-h ole-torus systems, resulting from either hypernovae or black-hole-neutron-s tar coalescence. We show that a nonaxisymmetric torus may also radiate grav itational radiation, powered by the spin energy of the black hole. The coup ling to the spin energy of the black hole operates by equivalence in poloid al topology to pulsar magneto spheres. Results calculated in the suspended- accretion state indicate that GRBs are potentially the most powerful LIGO/V IRGO burst sources in the Universe, with an expected duration of 10-15 s on a horizontal branch of 1-2 kHz in the f(f) diagram.