In the 1970s well-known papers by Bekenstein and Hawking based on previous work by Christodoulou and Ruffini gradually established that an entropy must be associated with black-hole solutions of field equations of General Relativity.Ĭhristodoulou and Ruffini were the first to study the possibility of extracting energy from a black hole by describing in detail the physics of particles around a Kerr black hole. Raiteri, in Variational and Extremum Principles in Macroscopic Systems, 2005 1 Introduction The Geometric Variational Framework for Entropy in General Relativity
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