SNAP: supernova/acceleration probe an experiment to measure the properties of the accelerating universe

Details SNAP: supernova/acceleration probe an experiment to measure the properties of the accelerating universe SNAP: supernova/acceleration probe an experiment to measure the properties of the accelerating universe

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aipc..540..263s&link_type=abstract

PARTICLE PHYSICS AND COSMOLOGY: Second Tropical Workshop. AIP Conference Proceedings, Volume 540, pp. 263-280 (2000).

Physics

Supernovae, Astronomical Telescopes, Space-Time Configurations, Cosmology, Velocity Measurement, Brightness, Distance Measurement, Mass

Scientific paper

A ~2-meter satellite telescope with a 1-square-degree optical imager, a small near-IR imager, and a three-arm near-UV-to-near-IR spectrograph can discover over 2000 Type Ia supernovae in a year at redshifts between z=0.1 and 1.7, and follow them with high-signal-to-noise calibrated light-curves and spectra. The resulting data set can determine the cosmological parameters with precision: mass density ΩM to +/-0.02, vacuum energy density ΩΛ to +/-0.05, and curvature Ωk to +/-0.06. The data set can test the nature of the ``dark energy'' that is apparently accelerating the expansion of the universe. In particular, a cosmological constant dark energy can be differentiated from alternatives including a range of ``quintessence'' dynamical scalar-field models, by measuring the ratio of the dark energy's pressure to its density to +/-0.05 over a range of redshifts. The large numbers of supernovae across a wide range of redshifts are necessary but not sufficient to accomplish these goals; the controls for systematic uncertainties are primary drivers of the design of this space-based experiment. These systematic and statistical controls cannot be obtained with other ground-based and/or space-based telescopes, either currently in construction or in planning stages. .

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