We study the supersymmetric solutions of 11-dimensional supergravity with a factor of AdS2 made of M2-branes. Such solutions can provide gravity duals of superconformal quantum mechanics, or through double Wick rotation, the generic bubbling geometry of M-theory which are 1/16-BPS. We show that, when the internal manifold is compact, it should take the form of a warped U(1)-fibration over an 8-dimensional Kahler space.
@article{arxiv.hep-th/0607093,
title = {Comments on AdS2 solutions of D=11 Supergravity},
author = {Nakwoo Kim and Jong-Dae Park},
journal= {arXiv preprint arXiv:hep-th/0607093},
year = {2009}
}