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Title: MODEL-INDEPENDENT DETERMINATION OF CURVATURE PARAMETER USING H(z) AND D{sub A} (z) DATA PAIRS FROM BAO MEASUREMENTS

We present a model-independent determination of the curvature parameter Ω {sub k} using the Hubble parameter H(z) and the angular diameter distance D{sub A} (z) from recent baryon acoustic oscillation (BAO) measurements. Each H(z) and D{sub A} (z) pair from a BAO measurement can constrain a curvature parameter. The accuracy of the curvature measurement improves with increased redshift of H(z) and D{sub A} (z) data. By using the H(z) and D{sub A} (z) pair derived from a BAO Lyman α forest measurement at z = 2.36, the Ω {sub k} is confined to be –0.05 ± 0.06, which is consistent with the curvature of −0.037{sub −0.042}{sup +0.044} constrained by the nine year Wilkinson Microwave Anisotropy Probe data only. Considering future BAO measurements, at least one order of magnitude improvement of this curvature measurement can be expected.
Authors:
;  [1] ; ;  [2]
  1. Department of Physics, Tsinghua University, Beijing 100084 (China)
  2. Department of Astronomy, Beijing Normal University, Beijing 100875 (China)
Publication Date:
OSTI Identifier:
22365746
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 789; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCURACY; ANISOTROPY; ASTROPHYSICS; BARYONS; COSMOLOGY; LYMAN LINES; MICROWAVE RADIATION; OSCILLATIONS; PROBES; RED SHIFT