In theoretical physics, T-duality (short for target-space duality) is an equivalence of two physical theories, which may be either quantum field theories or string theories. In the simplest example of this relationship, one of the theories describes strings propagating in spacetime shaped like a circle of some radius R {\displaystyle R} , while the other theory describes strings propagating on a spacetime shaped like a circle of radius proportional to 1 / R {\displaystyle 1/R} .
In theoretical physics, T-duality (short for target-space duality) is an equivalence of two physical theories, which may be either quantum field theories or string theories. In the simplest example of this relationship, one of the theories describes strings propagating in spacetime shaped like a circle of some radius R {\displaystyle R} , while the other theory describes strings propagating on a spacetime shaped like a circle of radius proportional to 1 / R {\displaystyle 1/R} .
Source: Wikipedia "T-duality" · CC BY-SA 4.0
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