Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975s%26t....50...87b&link_type=abstract
Sky and Telescope, vol. 50, Aug. 1975, p. 87-90.
Astronomy and Astrophysics
Astronomy
Binary Stars, Black Holes (Astronomy), Gravitational Collapse, Stellar Evolution, Astronomical Models, Celestial Mechanics, Relativity, Singularity (Mathematics), Space-Time Functions, Stellar Rotation
Scientific paper
Energetic processes in black holes are discussed qualitatively. The external gravitational field of a black hole is described, and accretion of matter onto a rotating black hole is discussed in detail. The hypothesis that quasars may be massive black holes surrounded by immense accretion disks is explored. The laws of black-hole mechanics, as formulated by Bardeen, Carter, and Hawking (1973), are outlined, and the Penrose process of energy extraction is illustrated. The existence of physically real singularities is demonstrated together with the necessity of quantizing gravitational fields in order to explain the phenomenon of a singularity. Four possibilities regarding the nature of a singularity are enumerated: a region of infinite tidal gravitational forces, a region where null geodesics terminate, a topological wormhole linking physically separate universes, and some combination of these three. Binary star systems are noted which may contain black holes, including SMC X-1 and Cyg X-1.
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