A String and M - theory Origin for the Salam - Sezgin Model

An M/string-theory origin for the six-dimensional Salam-Sezgin chiral gauged super-gravity is obtained, by embedding it as a consistent Pauli-type reduction of type I or het-erotic supergravity on the non-compact hyperboloid H 2,2. We can also obtain embeddings of larger, non-chiral, gauged supergravities in six dimensions, whose consistent truncation yields the Salam-Sezgin theory. The lift of the Salam-Sezgin (Minkowski) 4 × S 2 ground state to ten dimensions is asymptotic at large distances to the near-horizon geometry of the NS5-brane.