The Official String Theory Web Site:--> Theatre :--> String Colloquium 14
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T Duality

. T duality was the major discovery during the period between string revolutions from 1986-1992. The simplest case has one compact dimension — a circle of radius R.
Momentum excitations: En = n/R
Winding mode excitations: Em = 2 p T R m
T is the string tension T = (2 p Lst2)-1
DX vs DE
T duality is the invariance of a theory under switching m with n and R with Lst2/R. The implication of T duality is that quantum geometry at short distances falls under a new Generalized Uncertainty Principle:

The Second Superstring Revolution // String Theory: a multihistory

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