M-BRANES, ANTI-M-BRANES AND NON-EXTREMAL BLACK-HOLES

An M-brane and anti-M-brane scheme is proposed to study non-extremal 4 D and 5D black holes, The improved non-extremal intersecting M-brane s olutions proposed here involve two sets of harmonic functions, The con straints among the pressures are found, and new features in the M-bran e and anti-M-brane picture are demonstrated, which resolve the discrep ancy in the number of free parameters in the D-brane picture. In terms of the ''numbers'' of M-branes and anti-M-branes, the prefactors of t he entropies are found to be model independent, and the Bekenstein-Haw king entropy assumes the duality invariant form which is consistent wi th the microscopic explanation of the black hole entropy.