The black hole.
Abstract
The phenomenon of a black hole is described with reference to the three levels of gravitational collapse, the three parameters which uniquely specify the properties of a black hole, and the three signals from a black hole. The process of collapse to a black hole is described for a uniform spherically symmetric cloud of dust and is compared and contrasted with the final collapse of the universe. Quantum fluctuations in the geometry of spacetime are analyzed as a kind of gravitational collapse going on all the time and everywhere at small distances. It is shown why mass, charge, and angular momentum are the only parameters which fix the properties of a KerrNewman black hole at the classical level and how the baryon and lepton numbers are transcended in blackhole physics. Particle motion and wave propagation in blackhole geometry are analyzed, and it is shown that a blackhole will give out three signals: gravitational radiation at the time of formation, Xrays fron accretion after formation, and 'activity' produced by release of rotational energy.
 Publication:

Astrophysics and Gravitation
 Pub Date:
 1974
 Bibcode:
 1974asgr.proc..279W
 Keywords:

 Big Bang Cosmology;
 Black Holes (Astronomy);
 Gravitational Collapse;
 Stellar Evolution;
 Astronomical Models;
 Black Body Radiation;
 Gravitational Waves;
 Relativity;
 Astrophysics