4.8 Article

Galaxy Correlation Functions Provide a More Robust Cosmological Standard Ruler

Journal

PHYSICAL REVIEW LETTERS
Volume 121, Issue 2, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.121.021302

Keywords

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Funding

  1. U.S. Department of Energy [DE-SC0009946]
  2. European Research Council under the European Community Seventh Framework Programme ERC-StG EDECS [279954]
  3. National Science Foundation [AST-1612085]
  4. Alfred P. Sloan Foundation
  5. National Science Foundation
  6. U.S. Department of Energy Office of Science
  7. U.S. Department of Energy (DOE) [DE-SC0009946] Funding Source: U.S. Department of Energy (DOE)

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We show how a characteristic length scale imprinted in the galaxy two-point correlation function, dubbed the linear point, can serve as a comoving cosmological standard ruler. In contrast to the baryon acoustic oscillation peak location, this scale is constant in redshift and is unaffected by nonlinear effects to within 0.5 percent precision. We measure the location of the linear point in the galaxy correlation function of the LOWZ and CMASS samples from the Twelfth Data Release (DR12) of the Baryon Oscillation Spectroscopic Survey (BOSS) Collaboration. We combine our linear-point measurement with cosmic-microwave-background constraints from the Planck satellite to estimate the isotropic-volume distance D-V(z), without relying on a model-template or reconstruction method. We find DV (0.32) = 1264 +/- 28 Mpc and D-V (0.57) = 2056 +/- 22 Mpc, respectively, consistent with the quoted values from the BOSS Collaboration. This remarkable result suggests that all the distance information contained in the baryon acoustic oscillations can be conveniently compressed into the single length associated with the linear point.

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