The emergence of AdS(2) from quantum fluctuations
  We have shown how the quantization of two-dimensional quantum gravity with an action which contains only a positive cosmological constant and boundary cosmological constants leads to the emergence of a spacetime which can be described as a constant negative curvature spacetime with superimposed quantum fluctuations. 
J. Ambjorn, R. Janik, W. Westra, S. Zohren