AdS5 × S5 untwisted Original Research Article

Noting that T-duality untwists S5 to CP2 × S1, we construct the duality chain: n = 4 super Yang-Mills → type IIB superstring on AdS5 × S5 → type IIA superstring on AdS5 × CP2 × S1 → M-theory on AdS5 × CP2 × T2. This provides another example of supersymmetry without supersymmetry: on AdS5 × CP2 × S1, type IIA supergravity has SU(3) × U(1) × U(1) × U(1) and N = 0 supersymmetry but type IIA string theory has SO(6) and N = 8. The missing superpartners are provided by stringy winding modes. We also discuss IIB compactifications to AdS5 with N = 4, N = 2 and N = 0.