Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.255..539o&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 255, April 1, 1992, p. 539-544.
Astronomy and Astrophysics
Astronomy
5
Angular Momentum, Black Holes (Astronomy), Quadratic Equations, Thermodynamics, Kerr Effects, Schwarzschild Metric, Surface Temperature
Scientific paper
The thermodynamics of the event horizons and of the inner horizons are described in a unified manner by using a dimensionless parameter H. It is defined by h = a/rH = h+ on the event horizons, and varies in the range of 0 to 1, while it is also given by h = rH/a = a/r = h- on the inner horizons in the range of 1 to infinity, where a = J/Mc is the angular momentum radius and rH = r+, r- are the radii of the outer and inner horizons respectively. Every thermodynamic variable, other than the mass M and the angular momentum J, is also defined on both the outer and inner horizons, and its values form a pair of the roots of a quadratic equation with M and J contained in the coefficients, similar to the horizon radii r+/- and H+/-. It is also shown that this pair of each variable constitutes mirror images of each other with respect to the extreme Kerr state.
Kaburaki Osamu
Okamoto Isao
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