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For questions where the dynamical variables are fields, that is, functions of several variables (typically, one time coordinate and several space coordinates). Comprises both classical field theory and quantum field theory. Use this tag when the question applies to both classical and quantum phenomena. Otherwise, use the specific tag instead.

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One common way in studying Symmetry Protected Topological(SPT) phases with a global symmetry G is to promote G to a gauge symmetry and couple the system to a flat gauge field A for G. Then one can int …
asked Mar 14 '15 by Zitao Wang