First Cosmological Constraints on Dark Energy from the Radial Baryon Acoustic Scale

Details First Cosmological Constraints on Dark Energy from the Radial Baryon Acoustic Scale First Cosmological Constraints on Dark Energy from the Radial Baryon Acoustic Scale

2008-08-14

arxiv.org/abs/0808.1921v4

Phys.Rev.Lett.103:091302,2009

Astronomy and Astrophysics

Astrophysics

5 pages, 2 figures. Shorter abstract and introduction to fit into PRL. Final version, identical to the one published in PRL, e

Scientific paper

10.1103/PhysRevLett.103.091302

We present cosmological constraints arising from the first measurement of the radial (line-of-sight) baryon acoustic oscillations (BAO) scale in the large scale structure traced by the galaxy distribution. Here we use these radial BAO measurements at z = 0.24 and z = 0.43 to derive new constraints on dark energy and its equation of state for a flat universe, without any other assumptions on the cosmological model: w = -1.14 +/- 0.39 (assumed constant), Omega_m = 0.24+0.06-0.05. If we drop the assumption of flatness and include previous cosmic microwave background and supernova measurements, we find w = -0.974 +/- 0.058, Omega_m = 0.271 +/- 0.015, and Omega_k = -0.002 +/- 0.006, in good agreement with a flat cold dark matter cosmology with a cosmological constant. To our knowledge, these are the most stringent constraints on these parameters to date under our stated assumptions.

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