| Implications For The Hubble Constant from the First Seven Supernovae at (2007) | |||||||||||||
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| The Supernova Cosmology Project has discovered over twenty-eight supernovae (SNe) at 0:35 ! z ! 0:65 in an ongoing program that uses Type Ia SNe as high-redshift distance indicators. Here we present measurements of the ratio between the locally observed and global Hubble constants, H L 0 =H G 0 , based on the first 7 SNe of this high-redshift data set compared with 18 SNe at z 0:1 from the Cal'an/Tololo survey. If\Omega M 1, then light-curve-width corrected SN magnitudes yield H L 0 =H G 0 ! 1:10 (95% confidence level) in both a = 0 and a flat universe. The analysis using the SNe Ia as standard candles without a light-curve-width correction yields similar results. These results rule out the hypothesis that the discrepant ages of the Universe derived from globular clusters and recent measurements of the Hubble constant are attributable to a locally underdense bubble. Using the Cepheid-distance-calibrated absolute 1 E. O. Lawrence Berkeley National Laboratory, Berkeley, Calif... | |||||||||||||
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