Kaluza-Klein supergravity on AdS3 x S3 -: art. no. 036

We construct a Chern-Simons type gauged N = 8 supergravity in three spacetime dimensions with gauge group SO(4) x T-infinity over the infinite dimensional coset space SO(8, infinity)/ (SO(8) x SO(infinity)), where T-infinity is an infinite dimensional translation subgroup of SO (8, infinity). This theory describes the effective interactions of the (infinitely many) supermultiplets contained in the two spin-1 Kaluza-Klein towers arising in the compactification of N = (2, 0) supergravity in six dimensions on AdS(3) X S-3 with the massless supergravity multiplet. After the elimination of the gauge fields associated with T-infinity, one is left with a Yang Mills type gauged supergravity with gauge group SO(4), and in the vacuum the symmetry is broken to the (super-) isometry group of AdS(3) X S-3, with infinitely many fields acquiring masses by a variant of the Brout-Englert-Higgs effect.