Robust constraints on dark energy and gravity from galaxy clustering data

Details Robust constraints on dark energy and gravity from galaxy clustering data Robust constraints on dark energy and gravity from galaxy clustering data

2012-02-23

arxiv.org/abs/1202.5238v2

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

8 pages, 3 figures. Version with minor revisions, accepted for publication in MNRAS

Scientific paper

Galaxy clustering data provide a powerful probe of dark energy. We examine how the constraints on the scaled expansion history of the universe, x_h(z)=H(z)s (with s denoting the sound horizon at the drag epoch), and the scaled angular diameter distance, x_d(z)=D_A(z)/s, depend on the methods used to analyze the galaxy clustering data. We find that using the observed galaxy power spectrum, P_g^{obs}(k), x_h(z) and x_d(z) are measured more accurately and are significantly less correlated with each other, compared to using only the information from the baryon acoustic oscillations (BAO) in P_g^{obs}(k). Using the {x_h(z), x_d(z)} from P_g^{obs}(k) gives a DETF dark energy FoM approximately a factor of two larger than using the {x_h(z), x_d(z)} from BAO only; this provides a robust conservative method to go beyond BAO only in extracting dark energy information from galaxy clustering data. We find that a Stage IV galaxy redshift survey, with 0.7

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