Determination of a negative curvature of the Universe from the   magnitude-redshift relation of high redshift supernovae
  Recent observations of high redshift Supernovae at lower than expected value of the Hubble constant, widely interpreted as an evidence for accelerating expansion of the Universe, could alternatively be explained assuming a hyperbolic Universe with a negative spatial curvature of the order of k = - 1/(2100 Mpc). 
Mikolaj "Mik" Sawicki