Quantifying systematic uncertainties in supernova cosmology

Details Quantifying systematic uncertainties in supernova cosmology Quantifying systematic uncertainties in supernova cosmology

2008-01-16

arxiv.org/abs/0801.2484v1

JCAP 0802:008,2008

Astronomy and Astrophysics

Astrophysics

Accepted for publication in JCAP

Scientific paper

10.1088/1475-7516/2008/02/008

Observations of Type Ia supernovae used to map the expansion history of the Universe suffer from systematic uncertainties that need to be propagated into the estimates of cosmological parameters. We propose an iterative Monte-Carlo simulation and cosmology fitting technique (SMOCK) to investigate the impact of sources of error upon fits of the dark energy equation of state. This approach is especially useful to track the impact of non-Gaussian, correlated effects, e.g. reddening correction errors, brightness evolution of the supernovae, K-corrections, gravitational lensing, etc. While the tool is primarily aimed for studies and optimization of future instruments, we use the ``Gold'' data-set in Riess et al. (2007) to show examples of potential systematic uncertainties that could exceed the quoted statistical uncertainties.

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