"Hunting the runaway instability in general relativistic accretion disks", and the abstract is given below:
Abstract: Central engines of gamma-ray bursts, both short and long, are most likely powered by black hole accretion, which is one of the most efficient mechanisms for extracting the dormant rest mass energy of matter. Accretion disks associated with GRBs, whether coming from neutron stars coalescences or core collapse, are necessarily massive, relativistic and self-gravitating. Energetics and duration of the burst depend on the stability of such disks. The runaway instability can significantly reduce the lifetime the disk. When an accretion disk falls prey to the runaway instability, a large portion of its mass is rapidly devoured without a chance to produce the burst. Despite decades of effort, it is still unclear under which conditions such instability can occur. In this study, I will use three-dimensional hydrodynamic simulations in fully dynamic general relativity to demonstrate the existence and development of the runaway instability for a particular example of the accretion disk.