Mass Spectrum of D = 11 Supergravity on AdS 2 × S

We compute the Kaluza-Klein mass spectrum of the D = 11 supergravity compactified on AdS2× S × T 7 and arrange it into representations of the SU(1, 1|2) superconformal algebra. This geometry arises in M theory as the near horizon limit of a D = 4 extremal black-hole constructed by wrapping four groups of M-branes along the T . Via AdS/CFT correspondence, our result gives a prediction for the spectrum of the chiral primary operators in the dual conformal quantum mechanics yet to be formulated. jul, [email protected]