Abstract (Elsevier)
Various classes of extended black hole solutions of D =11 supergravity theory are presented. It is shown that D =11 supergravity admits a class of “electric” black p -brane solutions for p =2,4,6 and a “magnetic” type of black five-brane solution. Each of these solutions is characterized by a mass and a charge parameter. The only supersymmetric members of these families are the extreme cases where Bogomol'nyi type of bounds are saturated by the parameters. The extreme cases also allow multi-source generalizations. Upon double dimensional reduction these families give rise to two new solutions of Type IIA string theory and one of these is a black five-brane.