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T Duality 
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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