Effect of spin on the quantum entropy of black holes - art. no. 084028

By using the Newman-Penrose formalism and 't Hooft brick wall model, the qu antum entropies of the Kerr-Newman black hole due to the Dirac and electrom agnetic fields are calculated and the effects of the spins of the photons a nd Dirac particles on the entropies are investigated. It is shown that the entropies depend only on the square of the spins of the particles and the c ontribution of the spins is dependent on the rotation of the black hole, ex cept that different fields obey different statistics.