Mathematics – Logic
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20643g&link_type=abstract
Spitzer Proposal ID #20643
Mathematics
Logic
Scientific paper
The current standard cosmological model has been called "preposterous" because it requires a finely tuned dark energy component. We propose a stringent test of the accelerating universe using type Ia supernovae observed in the infrared rest-frame K-band. At redshifts near z=0.6, the K-band slides nicely into the IRAC 3.6 micron band. The infrared has a number of exceptional properties. The effects of dust extinction are minimal, reducing a major systematic that has been suspected of dimming high-redshift supernovae. Also, recent work indicates that type Ia supernovae are true standard candles in the infrared meaning that evolutionary biases will be reduced. We find that good signal-to-noise measurements of 4 type Ia events at z~0.6 will differentiate between an accelerating and low-density universe at more than the 99% confidence level, and make a critical test of the dark energy paradigm. Studying high redshift supernovae in the infrared is not possible from the ground and rest-frame K-band observations can only be done with Spitzer and IRAC. NASA and DOE are currently considering the optimum mission concept to investigate the properties of the dark energy. This proposed experiment will test the feasibility of using SNIa in the infrared as a reliable way of mapping the expansion history of the universe with the Joint Dark Energy Mission.
Aguilera Claudio
Becker Andy
Blondin Stephane
Challis Peter
Chornock Ryan
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