Cosmological Constraint from the 2dF QSO Spatial Power Spectrum

Abstract

In this paper we obtain constraints on the cosmological density parameters, Ω_m and Ω_b, by comparing the preliminary measurement of the QSO power spectrum from the two degree field QSO redshift survey with results from an analytic technique of power spectrum estimation, described in this paper. We demonstrate the validity of the analytic approach by comparing the results with the power spectrum of an N-body simulation. We find a better fit to the shape of the QSO power spectrum for low density models with Ω_m= 0.1-0.4. We show that a finite baryon fraction Ω_b/Ω_m=0.2, consistent with observations of the CMB anisotropies and nucleosynthesis, fits the observational result of the 2QZ survey better, though the constraint is not very tight. By using the Fisher matrix technique, we investigate just how a survey would be required before a significant constraint on the density parameters can be made. We demonstrate that the constraint could be significantly improved if the survey was four times larger.

16 pages, 6 figures, MNRAS, in press

References in corpus (11)

• The 2dF QSO Redshift Survey - II. Structure and evolution at high redshift
• Cosmological redshift-space distortion on clustering of high-redshift objects: correction for nonlinear effects in power spectrum and tests with N-body simulations
• Two-point correlation function of high-redshift objects: an explicit formulation on a light-cone hypersurface
• The 2dF QSO Redshift Survey - VII. Constraining Cosmology from Redshift Space Distortions via xi(sigma,pi)
• Acoustic Oscillations in the Early Universe and Today
• Clustering of dark matter halos on the light-cone: scale-, time- and mass-dependence of the halo biasing in the Hubble volume simulations
• The 2dF QSO Redshift Survey - IV. The QSO Power Spectrum from the 10k Catalogue
• Two-point correlation functions on the light cone: testing theoretical predictions against N-body simulations
• The Light-cone Effect on the Clustering Statistics in the Cosmological Redshift Space
• The 2dF QSO Redshift Survey - VIII. Absorption systems in the 10k catalogue
• Can Geometric Test Probe the Cosmic Equation of State ?

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• The 2dF QSO Redshift Survey - XI. The QSO Power Spectrum
• Optimal Weighting Scheme in Redshift-space Power Spectrum Analysis and a Prospect for Measuring the Cosmic Equation of State
• Gravitational Lensing by a Compound Population of Halos: Standard Models
• Measuring Cosmological Parameters with the SDSS QSO Spatial Power Spectrum Analysis to Test the Cosmological Principle
• Power Spectrum Analysis of the 2dF QSO Sample Revisited
• Vacuum Polarization in an Anti-de Sitter Space as an Origin for a Cosmological Constant in a Brane World