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More interestingly, we showed that some of the spacetimes that are solutions to this theory contain a four-dimensional universe that lives behind the event horizon of an extended object, a “p-brane” or “black brane,” that is embedded in a background D-dimensional spacetime.
Then the modes of one type of string are compatible with the vibrations on the p-brane, and since these are compatible with vibrations of another string type these p-branes define S or T duality relationships between strings.
Do Germany, Argentina, and the United States lag behind in theoretical physics because standard German, Spanish, and English don't have words for "p-brane"?
However, a belief in M-theory automatically begs the acceptance of Parallel Universes as each p-brane is a "universe" onto itself.