title: Consistency tests for the cosmological constant.
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.
authors.affiliation: Oxford University, Astrophysics, Denys Wilkinson Building, Keble Road, OX1 3RH, United Kingdom.
authors.forename: Caroline
authors.initials: C
authors.lastname: Zunckel
authors.forename: Chris
authors.initials: C
authors.lastname: Clarkson