To Bin or Not To Bin: Decorrelating the Cosmic Equation of State

Details To Bin or Not To Bin: Decorrelating the Cosmic Equation of State To Bin or Not To Bin: Decorrelating the Cosmic Equation of State

2007-10-01

arxiv.org/abs/0710.0373v1

Astropart.Phys.29:424-441,2008

Astronomy and Astrophysics

Astrophysics

26 pages, 28 figures

Scientific paper

10.1016/j.astropartphys.2008.04.

The physics behind the acceleration of the cosmic expansion can be elucidated through comparison of the predictions of dark energy equations of state to observational data. In seeking to optimize this, we investigate the advantages and disadvantages of using principal component analysis, uncorrelated bandpowers, and the equation of state within redshift bins. We demonstrate that no one technique is a panacea, with tension between clear physical interpretation from localization and from decorrelated errors, as well as model dependence and form dependence. Specific lessons include the critical role of proper treatment of the high redshift expansion history and the lack of a unique, well defined signal-to-noise or figure of merit.

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