Issue
EPL
Volume 85, Number 6, March 2009
Article Number 60009
Number of page(s) 4
Section General
DOI http://dx.doi.org/10.1209/0295-5075/85/60009
Published online 08 April 2009
EPL, 85 (2009) 60009
DOI: 10.1209/0295-5075/85/60009

No contributions to the extremal–black-hole entropy from spin fields

Li-Qin Mi

Department of Physics, Zhejiang University of Technology - Hangzhou 310032, China

miliqin@sina.com

received 18 January 2009; accepted in final form 27 February 2009; published March 2009
published online 8 April 2009

Abstract
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.

PACS
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