Mathematics – Logic
Scientific paper
Oct 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aps..4cf..ca01k&link_type=abstract
American Physical Society, Four Corners Section Fall Meeting, October 1-2, 1999 The University of Arizona Tucson, AZ, abstract #
Mathematics
Logic
Scientific paper
Supernova explosions are bright enough to observe halfway across the Universe and recent work with large and homogeneous samples of nearby supernovae shows that they can be used as very precise distance indicators. Combining these properties allows an investigation of the history of cosmic expansion and the global geometry of the Universe. The latest results, reported by two teams of investigators, very strongly indicate that the Universe is not being decelerated as expected by the effects of ordinary matter in the Universe. Instead, the evidence, based on Type Ia supernovae, favors cosmic acceleration over the last 8 billion years in a Universe whose total age is about 14 billion years. When the supernova data are combined with observations of the Cosmic Microwave Background, they point toward a Universe which has the geometry of flat space and which will expand without limit. The observed acceleration is consistent with most (70the form of vacuum energy whose equation of state resembles that of the ancient Cosmological Constant suggested by Einstein in 1917.
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