0 D - brane surgery : energy conditions , traversable wormholes , and voids


D-branes are ubiquitous elements of any low-energy limit of string theory. We point out that negative tension D-branes violate all the standard energy conditions of the higher-dimensional spacetime they are embedded in; this opens the door to very peculiar solutions of the higher-dimensional Einstein equations. Building upon the (3+1)-dimensional… (More)


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