Gauging without initial symmetry

Abstract : The gauge principle is at the heart of a good part of fundamental physics: Starting with a group G of so-called rigid symmetries of a functional defined over space–time Σ , the original functional is extended appropriately by additional Lie(G) -valued 1-form gauge fields so as to lift the symmetry to Maps(Σ,G) . Physically relevant quantities are then to be obtained as the quotient of the solutions to the Euler–Lagrange equations by these gauge symmetries.
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Alexei Kotov, Thomas Strobl. Gauging without initial symmetry. J.Geom.Phys., 2016, 99, pp.184-189. ⟨10.1016/j.geomphys.2015.10.004⟩. ⟨hal-01555043⟩

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