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Title: Consistent modified gravity analysis of anisotropic galaxy clustering using BOSS DR11

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1213264
Grant/Contract Number:
SC-0007867; AC02-05CH11231
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 92; Journal Issue: 4; Related Information: CHORUS Timestamp: 2016-12-23 08:21:04; Journal ID: ISSN 1550-7998
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English

Citation Formats

Song, Yong-Seon, Taruya, Atsushi, Linder, Eric, Koyama, Kazuya, Sabiu, Cristiano G., Zhao, Gong-Bo, Bernardeau, Francis, Nishimichi, Takahiro, and Okumura, Teppei. Consistent modified gravity analysis of anisotropic galaxy clustering using BOSS DR11. United States: N. p., 2015. Web. doi:10.1103/PhysRevD.92.043522.
Song, Yong-Seon, Taruya, Atsushi, Linder, Eric, Koyama, Kazuya, Sabiu, Cristiano G., Zhao, Gong-Bo, Bernardeau, Francis, Nishimichi, Takahiro, & Okumura, Teppei. Consistent modified gravity analysis of anisotropic galaxy clustering using BOSS DR11. United States. doi:10.1103/PhysRevD.92.043522.
Song, Yong-Seon, Taruya, Atsushi, Linder, Eric, Koyama, Kazuya, Sabiu, Cristiano G., Zhao, Gong-Bo, Bernardeau, Francis, Nishimichi, Takahiro, and Okumura, Teppei. Thu . "Consistent modified gravity analysis of anisotropic galaxy clustering using BOSS DR11". United States. doi:10.1103/PhysRevD.92.043522.
@article{osti_1213264,
title = {Consistent modified gravity analysis of anisotropic galaxy clustering using BOSS DR11},
author = {Song, Yong-Seon and Taruya, Atsushi and Linder, Eric and Koyama, Kazuya and Sabiu, Cristiano G. and Zhao, Gong-Bo and Bernardeau, Francis and Nishimichi, Takahiro and Okumura, Teppei},
abstractNote = {},
doi = {10.1103/PhysRevD.92.043522},
journal = {Physical Review D},
number = 4,
volume = 92,
place = {United States},
year = {Thu Aug 27 00:00:00 EDT 2015},
month = {Thu Aug 27 00:00:00 EDT 2015}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1103/PhysRevD.92.043522

Citation Metrics:
Cited by: 11works
Citation information provided by
Web of Science

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  • We analyze the clustering of large scale structure in the Universe in a model independent method, accounting for anisotropic effects along and transverse to the line of sight. A large sample of 690,000 galaxies from The Baryon Oscillation Spectroscopy Survey Data Release 11 are used to determine the Hubble expansion H, angular distance D{sub A}, and growth rate G{sub Θ} at an effective redshift of z=0.57. After careful bias and convergence studies of the effects from small scale clustering, we find that cutting transverse separations below 40 Mpc/h delivers robust results while smaller scale data leads to a bias duemore » to unmodelled nonlinear and velocity effects. The converged results are in agreement with concordance ΛCDM cosmology, general relativity, and minimal neutrino mass, all within the 68% confidence level. We also present results separately for the northern and southern hemisphere sky, finding a slight tension in the growth rate --- potentially a signature of anisotropic stress, or just covariance with small scale velocities --- but within 68% CL.« less
  • Here, we develop a new methodology called double-probe analysis with the aim of minimizing informative priors in the estimation of cosmological parameters. We extract the dark-energy-model-independent cosmological constraints from the joint data sets of Baryon Oscillation Spectroscopic Survey (BOSS) galaxy sample and Planck cosmic microwave background (CMB) measurement. We measure the mean values and covariance matrix of {R, l a, Ω bh 2, n s, log(A s), Ω k, H(z), D A(z), f(z)σ 8(z)}, which give an efficient summary of Planck data and 2-point statistics from BOSS galaxy sample, where R = √Ω mH 2 0, and l a =more » πr(z *)/r s(z *), z * is the redshift at the last scattering surface, and r(z *) and r s(z *) denote our comoving distance to z * and sound horizon at z * respectively. The advantage of this method is that we do not need to put informative priors on the cosmological parameters that galaxy clustering is not able to constrain well, i.e. Ω bh 2 and n s. Using our double-probe results, we obtain Ω m = 0.304 ± 0.009, H 0 = 68.2 ± 0.7, and σ 8 = 0.806 ± 0.014 assuming ΛCDM; and Ω k = 0.002 ± 0.003 and w = –1.00 ± 0.07 assuming owCDM. The results show no tension with the flat ΛCDM cosmological paradigm. By comparing with the full-likelihood analyses with fixed dark energy models, we demonstrate that the double-probe method provides robust cosmological parameter constraints which can be conveniently used to study dark energy models. We extend our study to measure the sum of neutrino mass and obtain Σm ν < 0.10/0.22 (68%/95%) assuming ΛCDM and Σm ν < 0.26/0.52 (68%/95%) assuming wCDM. This paper is part of a set that analyses the final galaxy clustering dataset from BOSS.« less
  • We measure the large-scale cross-correlation of quasars with the Lyα forest absorption, using over 164,000 quasars from Data Release 11 of the SDSS-III Baryon Oscillation Spectroscopic Survey. We extend the previous study of roughly 60,000 quasars from Data Release 9 to larger separations, allowing a measurement of the Baryonic Acoustic Oscillation (BAO) scale along the line of sight c/(H(z = 2.36)r{sub s}) = 9.0±0.3 and across the line of sight D{sub A}(z = 2.36)/r{sub s} = 10.8±0.4, consistent with CMB and other BAO data. Using the best fit value of the sound horizon from Planck data (r{sub s} = 147.49 Mpc),more » we can translate these results to a measurement of the Hubble parameter of H(z = 2.36) = 226±8 km s{sup −1} Mpc{sup −1} and of the angular diameter distance of D{sub A}(z = 2.36) = 1590±60 Mpc. The measured cross-correlation function and an update of the code to fit the BAO scale (baofit) are made publicly available.« less
  • We report a detection of the baryon acousticoscillation (BAO) feature in the flux-correlation function of the Lyα forest of high-redshift quasars with a statistical significance of five standard deviations. The study uses 137,562 quasars in the redshift range 2.1 ≤ z ≤ 3.5 from the data release 11 (DR11) of the Baryon Oscillation Spectroscopic Survey (BOSS) of SDSS-III. This sample contains three times the number of quasars used in previous studies. The measured position of the BAO peak determines the angular distance, D A(z = 2.34) and expansion rate, H(z = 2.34), both on a scale set by the sound horizon at the drag epoch, r d. We find D A/r d = 11.28 ± 0.65(1σ)more » $$+2.8\atop{-1.2}$$(2σ) and D H/r d = 9.18 ± 0.28(1σ) ± 0.6(2σ) where D H = c/H. The optimal combination, ~D$$0.7\atop{H}$$ D$0.3\atop{A}/r d is determined with a precision of ~2%. For the value r d = 147.4 Mpc, consistent with the cosmic microwave background power spectrum measured by Planck, we find D A(z = 2.34) = 1662 ± 96(1σ) Mpc and H(z = 2.34) = 222 ± 7(1σ) km s -1 Mpc -1. Tests with mock catalogs and variations of our analysis procedure have revealed no systematic uncertainties comparable to our statistical errors. Our results agree with the previously reported BAO measurement at the same redshift using the quasar-Lyα forest cross-correlation. The autocorrelation and cross-correlation approaches are complementary because of the quite different impact of redshift-space distortion on the two measurements. The combined constraints from the two correlation functions imply values of D A/r d that are 7% lower and 7% higher for D H/r d than the predictions of a flat ΛCDM cosmological model with the best-fit Planck parameters. With our estimated statistical errors, the significance of this discrepancy is ≈2.5σ.« less