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U-duality symmetry of M-theory and S and T-duality of string theory can beused to study various black branes solutions. We explore some aspect of thisidea here. This symmetry can be used to get relations among various componentsof the metric of the black brane. These relations in turn give relations amongvarious components of the energy-momentum tensor. We show that, using theserelations, without knowing the explicit form of form fields, we can get theblack brane solutions. These features were studied previously in the context ofM-theory. Here we extensively studied them in string theory (type IIsupergravity). We also show that this formulation works for exotic branes. Wegive an example of a time-dependent system where this method is essential.

Implication of U-duality for black branes in M/string theory