Probing dark energy using baryonic oscillations in the galaxy power spectrum as a cosmological ruler

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 straight-forward 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 z~3 to delineate the baryonic peaks in the power spectrum, and derive corresponding constraints on the parameter w describing the equation of state of the dark energy. For example, a survey of three times the Sloan volume at z ~ 1 can produce a measurement with accuracy dw ~ 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.

arXiv commentSubmitted to Astrophysical Journal, 11 pages, 8 figures

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• Detection significance of Baryon Acoustic Oscillations peaks in galaxy and quasar clustering
• Prospects for cosmological research with the FAST array: 21-cm intensity mapping survey observation strategies
• Exploring HOD-dependent systematics for the DESI 2024 Full-Shape galaxy clustering analysis
• On the origin of the BAOtr-DESI tension
• Cosmic distance determination from photometric redshift samples using BAO peaks only
• Determining accurate measurements of the growth rate from the galaxy correlation function in simulations
• Large-scale periodicity in the distribution of QSO absorption-line systems
• Forecasting Cosmological Constraints from the Weak Lensing Magnification of Type Ia Supernovae Measured by the Nancy Grace Roman Space Telescope
• Numerical Simulations of the Dark Universe: State of the Art and the Next Decade
• Non-Affine Extensions of the Raychaudhuri Equation in the K-essence Framework
• A model of the anisotropic correlation function xi(rp, pi) in redshift space including redshift errors
• Mixing Bispectrum Multipoles Under Geometric Distortions
• Power-spectrum simulations of radial redshift distributions
• Illuminating the dark universe with a very high density galaxy redshift survey over a wide area
• Direct Determination of Expansion History Using Redshift Distortions
• Angular Diameter Distance Measurement with Galaxy Clustering in the Multipole Space
• Cosmological Constraints on Neutrino Masses in a Second-Order CPL Dark Energy Model
• New $H(z)$ measurement at Redshift = 0.12 with DESI Data Release 1
• Traces of Anisotropic Quasi-Regular Structure in the SDSS Data
• A cosmic speed-trap: a gravity-independent test of cosmic acceleration using baryon acoustic oscillations
• Comparing LambdaCDM, wCDM, and w0waCDM models with DESI DR2 BAO: Redshift-Resolved Diagnostics and the Role of rd
• Dark energy constraints and correlations with systematics from CFHTLS weak lensing, SNLS supernovae Ia and WMAP5
• Accelerating BAO Scale Fitting Using Taylor Series
• Cosmology with Type II Supernovae
• Constraining effective neutrino species with bispectrum of large scale structures
• The model-independent degeneracy-breaking point in cosmological models with interacting Dark Energy and Dark Matter
• From Geometry to Observation: Gravitational Waves and the Raychaudhuri Equation
• GalSBI-SPS: a stellar population synthesis-based galaxy population model for cosmology and galaxy evolution applications
• Cosmological constraints from the density gradient weighted correlation function
• Gravitational redshift from large-scale structure: nonlinearities, antisymmetries, and the dipole