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Speaker |
Lemos, José P. S. |
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Co-autors |
Jose' P. S. Lemos |
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Talk Title |
Definition and properties of quasi black holes |
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Abstract |
Objects that are on the verge of being extremal black holes but actually are distinct in many ways are called quasiblack holes. Quasiblack holes are defined here and treated in a unified way through the displaying of their properties. The main ones are (i) their geometry remains perfectly regular everywhere, in spite of the existence of infinite redshifts, (ii) in the limit, outer and inner regions become mutually impenetrable and disjoint, although, in contrast to the usual black holes, this separation is of a dynamical nature, rather than purely causal. It is also shown that quasiblack holes have to be extremal, if we accept only finite surface stresses. If, however, such unbound stresses are allowed, we derived a mass formula for the quasiblack hole that coincides with the mass formula for black holes but is obtained from different physical assumptions. |
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