A New Method For Cosmological Parameter Estimation From SNIa Data

Details A New Method For Cosmological Parameter Estimation From SNIa Data A New Method For Cosmological Parameter Estimation From SNIa Data

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21721405m&link_type=abstract

American Astronomical Society, AAS Meeting #217, #214.05; Bulletin of the American Astronomical Society, Vol. 43, 2011

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We present a new methodology to extract constraints on cosmological parameters from SNIa data obtained with the SALT2 lightcurve fitter. The power of our Bayesian method lies in its full exploitation of relevant prior information, which is ignored by the usual chisquare approach. Using realistic simulated data sets we demonstrate that our method outperforms the usual chisquare approach 2/3 of the time while achieving better long-term coverage properties. A further benefit of our methodology is its ability to produce a posterior probability distribution for the intrinsic dispersion of SNe. This feature can also be used to detect hidden systematics in the data.

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