Testing Cosmic Acceleration

Details Testing Cosmic Acceleration Testing Cosmic Acceleration

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001noao.prop..267g&link_type=abstract

NOAO Proposal ID #2001B-0267

Physics

Scientific paper

The peak brightness measurements of Type Ia supernovae indicate that the Hubble expansion is in acceleration and has somehow overcome the expected deceleration due to gravity. Even though it fits nicely with the predictions from the theoretical cosmologists' favorite flat universe, this rather extraordinary claim needs rigorous observational testing . The chief alternative explanations are intergalactic dust absorption and intrinsic changes in the luminosity of distant supernovae due to evolutionary effects. This semester we are proposing to test the accelerating universe model by discovering and studying SN Ia at redshifts between 0.9 and 1.1. In this range the transition from matter domination to acceleration provides a unique signature which is difficult to mimic with dust or supernova evolution. This proposal asks for WIYN time to obtain follow-up photometry of the SN Ia discovered, allowing us to tie our HST photometry to ground-based observations, as well as to obtain lights curves of SN Ia which will not be observed by HST.

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