No contributions to the extremal–black-hole entropy from spin fieldsLi-Qin Mi
Department of Physics, Zhejiang University of Technology - Hangzhou 310032, China
received 18 January 2009; accepted in final form 27 February 2009; published March 2009
published online 8 April 2009
The entropy of the extremal Reissner-Nordström black hole due to the gravitational, electromagnetic, neutrino and scalar fields is investigated by using the brick-wall model. Whether extremalization or quantization are carried out first, the entropy satisfies the Nernst theorem when the inner Cauchy horizon is taken into account. Therefore the quantum entropy of the extremal black hole, calculated via the brick-wall model, does not require any regularization.
04.70.Dy - Quantum aspects of black holes, evaporation, thermodynamics.
04.62.+v - Quantum fields in curved spacetime.
97.60.Lf - Black holes.
© EPLA 2009