Sergio Dain

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I describe the construction of initial data for the Einstein vacuum equations that can represent a collision of two black holes. I stress in the main physical ideas. The physical system we want to describe is a binary system of two black holes. It is expected that lot of such systems exist in the universe. Moreover, these systems are expected to have the(More)
Stationary, axisymmetric, vacuum, solutions of Einstein's equations are obtained as critical points of the total mass among all ax-isymmetric and (t, φ) symmetric initial data with fixed angular momentum. In this variational principle the mass is written as a positive definite integral over a spacelike hypersurface. It is also proved that if absolute(More)