Comments on AdS2 solutions of D=11 Supergravity(12)

We study the supersymmetric solutions of 11-dimensional supergravity with a factor of $AdS_2$ made of M2-branes. Such solutions can provide gravity duals of superconformal quantum mechanics, or through double Wick rotation, the generic bubbling geometry of

[10]J.P.GauntlettandS.Pakis,ThegeometryofD=11Killingspinors,JHEP0304(2003)

039[arXiv:hep-th/0212008].

J.P.Gauntlett,J.B.GutowskiandS.Pakis,ThegeometryofD=11nullKillingspinors,JHEP0312,049(2003)[arXiv:hep-th/0311112].

[11]A.Donos,ADescriptionOf1/4BpsCon gurationsInMinimalTypeIIBSUGRA,

arXiv:hep-th/0606199.