Static, spherically symmetric black holes with matter obeying certain energy conditions have ISCO radius no larger than 6M, with Schwarzschild saturating the bound.
Black Holes in Supergravity and String Theory
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We give an elementary introduction to black holes in supergravity and string theory. The focus is on BPS solutions in four- and higher-dimensional supergravity and string theory. Basic ideas and techniques are explained in detail, including exercises with solutions.
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2025 1verdicts
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Upper bound on the radius of the innermost stable circular orbit of black holes
Static, spherically symmetric black holes with matter obeying certain energy conditions have ISCO radius no larger than 6M, with Schwarzschild saturating the bound.