Beyond the Accelerating Universe, Supernovae at z>1

Details Beyond the Accelerating Universe, Supernovae at z>1 Beyond the Accelerating Universe, Supernovae at z>1

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aps..apr.h9004r&link_type=abstract

American Physical Society, April Meeting, 2003, April 5-8, 2003 Philadelphia, Pennsylvania, MEETING ID: APR03, abstract #H9.004

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Type Ia supernovae (SNe Ia) provide the only direct evidence for an accelerating universe, an extraordinary results which needs a rigorous test. The case for cosmic acceleration rests on the observation that Sne Ia at z=0.5 are 25fainter than they would be in a universe without acceleration. A powerful and straightforward way to assess the reliability of the SN Ia measurement and the cosmological framework of its interpretation is to look for cosmic deceleration at z>1. This would be a clear signature of a mixed dark-matter and dark-energy universe. Systematic errors in the SN Ia result attributed to grey dust or the simplest evolution of calibrated SN Ia luminosities would not show this change of sign (without additional tuning). A single SN Ia at z 1.7, found and followed by HST, demonstrated proof of this concept. We are currently discovering and measuring distances to new SNe Ia at z>1 discovered during the ongoing HST ACS GOODs Treasury program and we present current progress in this experiment.

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