QUANTIZATION OF BLACK-HOLES

A simple argument is presented in favour of the equidistant spectrum f or the horizon area of a black hole in semiclassical limit. The follow ing quantization rules for the mass M-N and horizon area A(Nj) are pro posed: M-n = m(p) [N(N+1)](1/4); A(Nj) = 8 pi l(p)(2) [root N(N+1) + r oot N(N+1) - j(j+1)]. Here both N and j are nonnegative integers or ha lf-integers. (C) 1998 Published by Elsevier Science B.V. All rights re served.