Cosmology with Type Ia Supernovae

Details Cosmology with Type Ia Supernovae Cosmology with Type Ia Supernovae

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aps..apr.v4003a&link_type=abstract

American Physical Society, April Meeting, 2004, May 1-4, 2004, Denver, Colorado April 2004, MEETING ID: APR04, abstract #V4.003

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The Hubble diagram for Type Ia supernovae provides the most direct current measurement of the expansion history of the universe --- and hence the most direct evidence for an accelerating expansion. This evidence has been increasingly strengthened, both by tests and improvements of the supernova measurements and by independent, cross-cutting cosmological measurements. There are now two important directions to pursue with the supernova cosmology work: (1) refining and further testing the supernovae as tools for cosmological measurements, and (2) extending and filling in the Hubble diagram to obtain a more complete and detailed expansion history of the universe. The first of these goals seeks to take advantage of an almost unique characteristic of supernovae as cosmological tools: they can be studied individually by their light curves and time-varying spectra and hence calibrated individually, not simply statistically. The second goal of a more complete Hubble diagram has an additional long term aim: studying the physics of the ``dark energy'' that is apparently accelerating the expansion of the universe. I will discuss the on-going and planned programs designed to accomplish these compelling goals, including the Nearby Supernova Factory and the SuperNova Acceleration Probe (SNAP).

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