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Home List of Titles Probing dark energy using baryonic oscillations in the galaxy power spectrum as a cosmological ruler
Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/42709
- Probing dark energy using baryonic oscillations in the galaxy power spectrum as a cosmological ruler
- Blake, Chris; Glazebrook, Karl
- 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.
- Publication type
- Journal article
- Astrophysical Journal, Vol. 594, no. 2 (Sep 2003), pp. 665-673
- Publication year
- Constant; Cosmological parameters; Equation-of-state; Evolution; Field; Large-scale structure; Parameters; Quintessence; Redshift survey; Supernovae; Surveys; Universe
- University of Chicago Press
- Publisher URL
- Copyright © 2003 The American Astronomical Society. All rights reserved.
- Peer reviewed