Comments on AdS2 solutions of D=11 Supergravity

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

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arXiv:hep-th/0607093v2 15 Jul 2006NakwooKimandJong-DaeParkDepartmentofPhysicsandResearchInstituteofBasicScience,KyungHeeUniversity,Seoul130-701,KoreaE-mail:,Abstract:Westudythesupersymmetricsolutionsof11-dimensionalsupergravitywithafactorofAdS2madeofM2-branes.Suchsolutionscanprovidegravitydualsofsuperconfor-malquantummechanics,orthroughdoubleWickrotation,thegenericbubblinggeometryofM-theorywhichare1/16-BPS.Weshowthat,whentheinternalmanifoldiscompact,itshouldtaketheformofawarpedU(1)- brationoveran8-dimensionalK¨ahlerspace.Keywords: