ENTROPY OF NONEXTREME CHARGED ROTATING BLACK-HOLES IN STRING THEORY

We give the explicit expression for four-dimensional rotating charged black hole solutions of N=4 (or N=8) superstring vacua, parametrized b y the ADM mass, four charges [two electric and two magnetic charges, e ach arising from a different U(1) gauge factor], and the angular momen tum (as well as the asymptotic values of four toroidal moduli of a two -torus and the dilaton-axion field). The explicit form of the thermody namic entropy is parametrized in a suggestive way as a sum of the prod uct of the ''left-moving'' and the ''right-moving'' terms, which may h ave an interpretation in terms of the microscopic degrees of freedom o f the corresponding D-brane configuration. We also give an analogous p arametrization of the thermodynamic entropy for the recently obtained five-dimensional rotating charged black holes parametrized by the ADM mass; three U(1) charges, and two rotational parameters (as well as th e asymptotic values of one toroidal modulus and the dilaton).