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The Second Superstring Revolution

Some amazing and unexpected equivalences called dualities have been uncovered that imply:
. The five superstring theories are actually five perturbative expansions of a single underlying theory about five different points!
. Excitations of various dimensions, called p-branes, occur in the non-perturbative spectrum. In certain respects they are as fundamental as strings, which in this context can be called one-branes.
. A sixth limit of the theory lives in eleven dimensions. This vacuum solution does not have string excitations. Rather, it has two-branes and five-branes.

The Second Superstring Revolution // String Theory: a multihistory

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