Lifting cosmic degeneracy within a single quasar survey

Abstract

In the almost Friedmann-Lema^itre model of the Universe, the density parameter, Omega_matter, and the cosmological constant, Omega_Lambda, measure curvature. Several linearly degenerate relations between these two parameters have recently been measured. Here, large scale structure correlations at \~100-150 h^-1 Mpc are found in the comoving three-dimensional separations of redshift z \approx 2 quasars. These function as a comoving standard rod of length L_LSS \approx 130+-10 h^-1 Mpc. A local maximum in the correlation function at \approx L_LSS/2 also appears to be significant. By combining separate radial and tangential standard ruler analyses, the lifting of the Omega_matter - Omega_Lambda linear degeneracy within a single data set is demonstrated for the first time.

6 pages, 5 figures, accepted for Astronomy & Astrophysics, minor changes from v1 to v2

References in corpus (5)

• The Sloan Digital Sky Survey: Technical Summary
• The 2dF QSO Redshift Survey - I. The Optical QSO Luminosity Function
• First Estimations of Cosmological Parameters From BOOMERANG
• The Discovery of a Luminous z=5.80 Quasar from the Sloan Digital Sky Survey
• Constraints on Cosmological Parameters from MAXIMA-1

Cited by in corpus (4)

• Apparent Clustering of Intermediate-redshift Galaxies as a Probe of Dark Energy
• The Cosmological Constant and Quintessence from a Correlation Function Comoving Fine Feature in the 2dF Quasar Redshift Survey
• How to distinguish a nearly flat Universe from a flat Universe using the orientation independence of a comoving standard ruler
• Where the Very Bright Matter is a Standard Ruler