title: New dark energy constraints from supernovae, microwave background, and galaxy clustering.
abstract: Using supernova, cosmic microwave background, and galaxy clustering data, we make the most accurate measurements to date of the dark energy density rho(X) as a function of cosmic time, constraining it in a rather model-independent way, assuming a flat universe. We find that Einstein's simplest scenario, where rho(X)(z) is constant, remains consistent with these new tight constraints and that a big crunch or big rip is more than 50 Gyr away for a broader class of models allowing such cataclysmic events. We discuss popular pitfalls and hidden priors.
authors.affiliation: Department of Physics and Astronomy, University of Oklahoma, 440 West Brooks Street, Norman, Oklahoma 73019, USA.
authors.forename: Yun
authors.initials: Y
authors.lastname: Wang
authors.forename: Max
authors.initials: M
authors.lastname: Tegmark