Mass spectrum of D=11 supergravity on AdS2 X S2 X T7

We compute the Kaluza-Klein mass spectrum of the D = 11 supergravity compactified on AdS(2) X S-2 X 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-7. 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. (C) 1999 Elsevier Science B.V. All rights reserved.