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Link to original content: http://en.wikipedia.org/wiki/Scherk–Schwarz_mechanism
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Scherk–Schwarz mechanism

From Wikipedia, the free encyclopedia

In theoretical physics, the Scherk–Schwarz mechanism (named after Joël Scherk and John Henry Schwarz) for a field φ basically means that φ is a section of a non-trivializable fiber bundle (not necessarily a vector bundle since φ needn't be linear) which is fixed by the model. This is called a twist by physicists.

Note that this can never occur in a spacetime which is homeomorphic to Rn, which is a contractible space. However, for Kaluza–Klein theories, the Scherk–Schwarz mechanism is a possibility which can't be neglected.