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Title:
Probing Dark Energy Using Baryonic Oscillations in the Galaxy Power Spectrum as a Cosmological Ruler
Authors:
Blake, Chris; Glazebrook, Karl
Affiliation:
AA(School of Physics, University of New South Wales, Sydney, NSW 2052, Australia; ), AB(Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218-2686 )
Publication:
The Astrophysical Journal, Volume 594, Issue 2, pp. 665-673. (ApJ Homepage)
Publication Date:
09/2003
Origin:
UCP
ApJ Keywords:
Cosmology: Cosmological Parameters, Cosmology: Large-Scale Structure of Universe, Surveys
DOI:
10.1086/376983
Bibliographic Code:
2003ApJ...594..665B

Abstract

We show that the baryonic oscillations expected in the galaxy power spectrum may be used as a ``standard cosmological ruler'' to facilitate accurate measurement of the cosmological equation of state. Our approach involves a straightforward measurement of the oscillation ``wavelength'' in Fourier space, which is fixed by fundamental linear physics in the early universe and hence is highly model-independent. We quantify the ability of future large-scale galaxy redshift surveys with mean redshifts z~1 and ~3 to delineate the baryonic peaks in the power spectrum, and we derive corresponding constraints on the parameter w describing the equation of state of the dark energy. For example, a survey of 4 times the Sloan volume at z~1 can produce a measurement with accuracy Δw~0.1. We suggest that this method of measuring the dark energy powerfully complements other probes, such as Type Ia supernovae, and suffers from a different (and arguably less serious) set of systematic uncertainties.
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