The gravitational collapse to rotating black holes is a cornerstone of Einstein's theory of General Relativity and among the most intriguing
phenomena in physics. Interest in this process is not just academic since the collapse of a compact star to a black hole also is among the most
intense sources of gravitational waves. I will discuss the application of a newly developed 3D, parallel and fully general relativistic
hydrodynamics code the gravitational collapse of uniformly rotating neutron stars to Kerr black holes. Special attention will be dedicated to
the dynamics of the matter as well as to that of the trapped surfaces that are generated during the collapse. The use of these surfaces allows
for a precise measurement of the black hole mass and spin. Finally, I will present recent results about the extraction of gravitational waves
from this process and the calculation of the efficiency of gravitational radiation in gravitational collapse.
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