Consistency tests for the cosmological constant |
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Authors: | Zunckel Caroline Clarkson Chris |
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Institution: | Oxford University, Astrophysics, Denys Wilkinson Building, Keble Road, OX1 3RH, United Kingdom. |
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Abstract: | We propose consistency tests for the cosmological constant which provide a direct observational signal if Lambda is wrong, regardless of the densities of matter and curvature. As an example of its utility, our flat case test can warn of a small transition of the equation of state w(z) from w(z)=-1 of 20% from SNAP (Supernova Acceleration Probe) quality data at 4-sigma, even when direct reconstruction techniques see virtually no evidence for deviation from Lambda. It is shown to successfully rule out a wide range of non-Lambda dark energy models with no reliance on knowledge of Omega_{m} using SNAP quality data and a large range for using 10;{5} supernovae as forecasted for the Large Synoptic Survey Telescope. |
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