Alternative N=2 supergravity in singular five dimensions with matter/gauge couplings Original Research Article

We present an extended study of our previous work on an alternative five-dimensional N=2 supergravity theory that has a single antisymmetric tensor and a dilaton as a part of supergravity multiplet. The new fields are natural Neveu–Schwarz massless fields in superstring theory. Our total matter multiplets include n copies of vector multiplets forming the sigma-model coset space SO(n,1)/SO(n), and n′ copies of hypermultiplets forming the quaternionic Kähler manifold Sp(n′,1)/Sp(n′)×Sp(1). We complete the couplings of matter multiplets to supergravity with the gauged group of the type SO(2)×Sp(n′)×Sp(1)×H×[U(1)]n−p+1 for an arbitrary gauge group H with p≡ dimH+1, and the isotropy group Sp(n′)×Sp(1) of the coset Sp(n′,1)/Sp(n′)×Sp(1) formed by the hypermultiplets. We also describe the generalization to singular 5D spacetime as in the conventional formulation.