The paper obtains a closed-form expression for the constrained Hodge dual of a p-form under the spherical constraint x_i x_i = 1, which reduces to the standard hypersurface Hodge star with unit normal.
A String and M-theory Origin for the Salam-Sezgin Model
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abstract
An M/string-theory origin for the six-dimensional Salam-Sezgin chiral gauged supergravity is obtained, by embedding it as a consistent Pauli-type reduction of type I or heterotic supergravity on the non-compact hyperboloid ${\cal H}^{2,2}$ times $S^1$. 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)$_4\times S^2$ ground state to ten dimensions is asymptotic at large distances to the near-horizon geometry of the NS5-brane.
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Hodge Duals in Spherical Compactifications
The paper obtains a closed-form expression for the constrained Hodge dual of a p-form under the spherical constraint x_i x_i = 1, which reduces to the standard hypersurface Hodge star with unit normal.