Abstract
The time symmetric initial value problem for black holes is discussed. It is shown that if a solution contains marginally trapped surfaces these correspond to minimal surfaces lying inside the black holes. Such minimal surfaces must have spherical topology. These minimal surfaces are used to obtain lower bounds for the areas of event horizons and upper bounds for the efficiency for radiating gravitational radiation. It is shown that moving black holes closer together reduces the energy available and that a single initially distorted black hole (perhaps formed just after a very assymetric collapse) cannot radiate more than 65% of its rest mass away. “Wormholes” are also briefly discussed.
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Gibbons, G.W. The time symmetric initial value problem for black holes. Commun.Math. Phys. 27, 87–102 (1972). https://doi.org/10.1007/BF01645614
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DOI: https://doi.org/10.1007/BF01645614