Black-Hole duality in four time and four space dimensions

Abstract

A black-hole solution in four time and four space dimensions ((4+4)-dimensions) is developed. It is emphasized that such a solution establishes a duality relation between the (1+3) and the (3+1) black-holes, which are part of the (4+4)-world. Moreover, it is found that a cosmological constant of the (1+3)-world is dual to the cosmological constant in the (3+1)-world.