Secondorder phase transitions in blackhole thermodynamics
Abstract
The physical meaning of secondorder phase transitions discovered by Davies in blackhole thermodynamics is discussed. It is argued that the phenomenon has nothing to do with phase transitions occurring in rotating selfgravitating fluids in Newtonian theory. We show that the internal state of a black hole remains unaffected after the phase transition. We also argue that the change of sign and infinite discontinuity in the heat capacity are of purely geometric origin, i.e., are determined by the embedding of an event horizon into a blackhole spacetime. This result supports the view that temperature cannot be used as a wellbehaved fundamental parameter in blackhole physics
 Publication:

Journal of Physics A Mathematical General
 Pub Date:
 March 1980
 DOI:
 10.1088/03054470/13/3/043
 Bibcode:
 1980JPhA...13.1113S
 Keywords:

 Astrophysics;
 Black Holes (Astronomy);
 Thermodynamic Properties;
 Angular Momentum;
 Einstein Equations;
 Entropy;
 Gravitational Fields;
 SpaceTime Functions;
 Astrophysics