Consistent holographic description of boost-invariant plasma
  Prior attempts to construct the gravity dual of boost-invariant flow of N=4 supersymmetric Yang-Mills gauge theory plasma suffered from apparent curvature singularities in the late time expansion. This Letter shows how these problems can be resolved by a different choice of expansion parameter. The calculations presented correctly reproduce the plasma energy-momentum tensor within the framework of second order viscous hydrodynamics. 
Michal P. Heller, R. Loganayagam, Michal Spalinski, Piotr Surowka,   Samuel E. Vazquez