New dark energy constraints from supernovae, microwave background and galaxy clustering

Details New dark energy constraints from supernovae, microwave background and galaxy clustering New dark energy constraints from supernovae, microwave background and galaxy clustering

2004-03-11

arxiv.org/abs/astro-ph/0403292v2

Phys.Rev.Lett.92:241302,2004

Astronomy and Astrophysics

Astrophysics

Matches accepted PRL version. 4 pages, 2 figs. Software using flux-averaging statistics to compute the likelihood of an arbitr

Scientific paper

10.1103/PhysRevLett.92.241302

Using the spectacular new high redshift supernova observations from the HST/GOODS program and previous supernova, CMB 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 vanilla 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 gigayears away for a broader class of models allowing such cataclysmic events. We discuss popular pitfalls and hidden priors: parametrizing the equation-of-state w_X(z) assumes positive dark energy density and no Big Crunch, and the popular parametrization w_X(z)=w_0 +w_0' z has nominally strong constraints from CMB merely because w_0' > 0 implies an unphysical exponential blow-up rho_X ~ e^{3 w_0' z}.

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