2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/34539I present results of two-dimensional general relativistic hydrodynamical simulations of constant specific angular momentum tori orbiting around a Schwarzschild black hole. After introducing axisymmetric perturbations, these objects either become unstable to the runaway instability or respond with regular oscillations. The latter, in particular, are responsible for quasi-periodic bursts of accretion onto the black hole as well as for the emission of intense gravitational radiation, with signal-to-noise ratios at the detector which are comparable or even larger than the typical ones expected in stellar-core collapse.Invited Talk at the 15th SIGRAV Conference, Frascati Sept. 2002; IOP Conference Series, one reference addedGeneral Relativity and Quantum CosmologyAstrophysicstext