Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978natur.275..725l&link_type=abstract
Nature, vol. 275, Oct. 26, 1978, p. 725.
Astronomy and Astrophysics
Astronomy
3
Astronomical Models, Black Holes (Astronomy), Theoretical Physics, Boundary Value Problems, Closures, Mathematical Models, Points (Mathematics), Space-Time Functions, Topology
Scientific paper
A definition of a black hole is given which is equivalent to Tipler's (1977) definition but is simpler and more clearly a formalization of the usual concept of a black hole. The new definition says that the black hole consists of the closure of the set of points consisting of (1) the topologically smallest future set containing the set T of points of a stably causal spacetime which belong to noncosmological trapped surfaces and (2) any points from which it is impossible to avoid falling into the black hole.
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