Absence of superconductivity in the 2D Hubbard model
  After receiving a number of comments and reviews from our colleagues who have suggested that our results could be greatly improved by other methods of extrapolation, we have decided to withdraw our paper entitled "Absence of superconductivity in the 2D Hubbard model" until we can perform these calculations. 
T.A. Maier, M. Jarrell, T.C. Schulthess, J.B. White