This is an old revision of this page, as edited by Mpatel (talk | contribs) at 11:27, 2 January 2006 (global symmetry doesn't just apply to QFT). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.
Revision as of 11:27, 2 January 2006 by Mpatel (talk | contribs) (global symmetry doesn't just apply to QFT)(diff) ← Previous revision | Latest revision (diff) | Newer revision → (diff)A global symmetry is a symmetry that holds for all points in the spacetime under consideration.
In quantum field theory, a global symmetry is any symmetry of a model which is not a gauge symmetry. A gauge symmetry is a symmetry which only allows us to predict the future evolution of a state given its current state up to a gauge transformation. So, a global symmetry is any symmetry, which acting upon any state, never acts to leave the current state invariant but yet changes the future or past state simultaneously.
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