Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975qjras..16....1s&link_type=abstract
Royal Astronomical Society, Quarterly Journal, vol. 16, Mar. 1975, p. 1-12.
Astronomy and Astrophysics
Astronomy
Black Holes (Astronomy), Energy Sources, Gravitational Collapse, Quasars, Radio Galaxies, Energy Conversion Efficiency, Gravitational Waves, Nuclear Fusion, Relativity, Stellar Rotation
Scientific paper
Black hole phenomena are investigated from the points of view of space-time and energy. The discussion draws heavily on special and general relativity. The possibility of gravity as a more efficient radio galaxy and quasar energy source than nuclear fusion is examined. The problem of observing black holes is approached, and the probability of Cygnus X-1 being a black hole is considered. The efficiency of mass conversion into gravitational waves upon merging of two black holes is discussed, with reference to the upper limit (30%) arrived at based on the ideas of Penrose and Hawking. The recent extension of that limit to 43% by including rotational energy is also explained. These figures compare to a potential efficiency of less than 1% by fusion of all the sun's hydrogen to Fe-56 nuclei.
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