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T Duality


T .Sometimes Theory A with large compact dimensions is equivalent to Theory B with small compact dimensions.

. This tells us about relationships among the five superstring theories:

Type IIA string theory on a circle of radius R is equivalent to Type IIB string theory on a circle of radius Lst2/R

Heterotic E8 X E8 string theory on a circle of radius R is equivalent to Heterotic SO(32) string theory on a circle of radius Lst2/R

. In each case, the duality transformation interchanges the momentum excitations and the winding-mode excitations.


The Second Superstring Revolution // String Theory: a multihistory


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