Error Analysis of Ia Supernova and Query on Cosmic Dark Energy
  Some serious faults in error analysis of observations for SNIa have been found. Redoing the same error analysis of SNIa, by our idea, it is found that the average total observational error of SNIa is obviously greater than $0.55^m$, so we can't decide whether the universe is accelerating expansion or not. 
Qiuhe Peng, Yiming Hu, Kun Wang, and Yu Liang
physics.gen-ph