Perturbation theory in the invariant subspace
classification
✦ hep-th
keywords
perturbationtheorymeasurephasepropertiesaction-anglecontributionscoordinates
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The unitary transformation of path-integral differential measure is described. The main properties of perturbation theory in the phase space of action-angle, energy-time variables are investigated. The measure in cylindrical coordinates is derived also. The dependence of perturbation theory contributions from global (topological) properties of corresponding phase spaces is shown.
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