The Redshift Sensitivities of Dark Energy Surveys

Details The Redshift Sensitivities of Dark Energy Surveys The Redshift Sensitivities of Dark Energy Surveys

2006-02-10

arxiv.org/abs/astro-ph/0602213v2

Phys.Rev. D73 (2006) 083001

Astronomy and Astrophysics

Astrophysics

11 pages, 10 figures, changes reflect published version

Scientific paper

10.1103/PhysRevD.73.083001

Great uncertainty surrounds dark energy, both in terms of its physics, and the choice of methods by which the problem should be addressed. Here we quantify the redshift sensitivities offered by different techniques. We focus on the three methods most adept at constraining w, namely supernovae, cosmic shear, and baryon oscillations. For each we provide insight into the family of w(z) models which are permitted for a particular constraint on either w=w0 or w=w0+wa(1-a). Our results are in the form of "weight functions", which describe the fitted model parameters as a weighted average over the true functional form. For example, we find the recent best-fit from the Supernovae Legacy Survey (w=-1.023) corresponds to the average value of w(z) over the range 0

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