Entropy of Neutrino Field in Kerr-Newman-de Sitter Space-time
GAO Chang-Jun1,2,4, SHEN You-Gen1,2,3,4
1Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030
2National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012
3Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100080
4Shanghai United Center for Astrophysics, Shanghai 200234
Entropy of Neutrino Field in Kerr-Newman-de Sitter Space-time
GAO Chang-Jun1,2,4;SHEN You-Gen1,2,3,4
1Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030
2National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012
3Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100080
4Shanghai United Center for Astrophysics, Shanghai 200234
Abstract： By using the improved brick wall model, we regard the two null horizons in Kerr-Newman-de Sitter space-time as two independent thermal equilibrium systems and we calculate the entropies of both horizons due to neutrino field. We propose that the so-called “ superradiant” modes cannot be considered because fermion fields does not display supperradiance. In fact, the nonsuperradiant part does exactly show the expected area-law entropy. Moreover, our cut-off ε, which does not require an angular cut-off, is independent of angle θ.
2003, Vol. 20 
