%0 Journal Article
%T Why the Entropy of a Black Hole is $A/4$?
%A Valeri P. Frolov
%J Physics
%D 1994
%I arXiv
%R 10.1103/PhysRevLett.74.3319
%X A black hole considered as a part of a thermodynamical system possesses the Bekenstein-Hawking entropy $S_H =A_H /(4l_{\mbox{\scriptsize{P}}}^2)$, where $A_H$ is the area of a black hole surface and $l_{\,\mbox{\scriptsize{P}}}$ is the Planck length. Recent attempts to connect this entropy with dynamical degrees of freedom of a black hole generically did not provide the universal mechanism which allows one to obtain this exact value. We discuss the relation between the 'dynamical' contribution to the entropy and $S_H$, and show that the universality of $S_H$ is restored if one takes into account that the parameters of the internal dynamical degrees of freedom as well as their number depends on the black hole temperature.
%U http://arxiv.org/abs/gr-qc/9406037v1