Hydromagnetic instabilities and magnetic field amplification in core collapse supernovae

Pablo Cerda-Duran

Some of the most violent events in the universe, the gamma ray burst, could be related to the gravitational collapse of massive stellar cores. The recent association of long GRBs to some class of type Ic supernova seems to support this view. In such scenario fast rotation, strong magnetic fields and general relativistic effects are key ingredients. It is thus important to understand the mechanism that amplifies the magnetic field under that conditions. I present global simulations of the magneto-rotational collapse of stellar cores in general relativity and semi-global simulations of hydromagnetic instabilities under core collapse conditions. I discuss the different mechanisms of magnetic field amplification during the collapse, the uncertainties in this process and the dynamical effects in the supernova explosion.