The laws of black hole mechanics are analogous to the laws of thermodynamics. The quantities of particular interest in gravitational
thermodynamics are the physical entropy S and the temperature β
−1, where these quantities are respectively proportional to the area
and surface gravity of the event horizon [1]. Other black hole properties, such as energy, angular momentum and conserved charges can
also be given a thermodynamic interpretation. In finding the thermodynamic quantities, one should use the quasilocal definitions for the
thermodynamic variables. By quasilocal, we mean that the quantity is constructed from information that exists on the boundary of a
gravitating system alone. Just as the Gauss law, such quasilocal quantities will yield information about the spacetime contained within
the system boundary. One of the advantage of using such a quasilocal method is that the formalism does not depend on the particular
asymptotic behavior of the system, so one can accommodate a wide class of spacetimes with the same formalism.
The laws of black hole mechanics are analogous to the laws of thermodynamics. The quantities of particular interest in gravitationalthermodynamics are the physical entropy S and the temperature β−1, where these quantities are respectively proportional to the areaand surface gravity of the event horizon [1]. Other black hole properties, such as energy, angular momentum and conserved charges canalso be given a thermodynamic interpretation. In finding the thermodynamic quantities, one should use the quasilocal definitions for thethermodynamic variables. By quasilocal, we mean that the quantity is constructed from information that exists on the boundary of agravitating system alone. Just as the Gauss law, such quasilocal quantities will yield information about the spacetime contained withinthe system boundary. One of the advantage of using such a quasilocal method is that the formalism does not depend on the particularasymptotic behavior of the system, so one can accommodate a wide class of spacetimes with the same formalism.
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