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The sp(8,R) invariant formulation of free field equations of massless fields of all spins in AdS4 available previously in terms of gauge invariant field strengths is extended to gauge potentials. As a by-product, free field equations for a massless gauge field are shown to possess both su(2,2)∼o(4,2) and sl(4,R)∼o(3,3) symmetry. The proposed formulation is well-defined in the AdS4 background but experiences...
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