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Title: Testing ΛCDM at the lowest redshifts with SN Ia and galaxy velocities

Journal Article · · Journal of Cosmology and Astroparticle Physics
;  [1];  [2];  [3]
  1. Department of Physics, University of Michigan, 450 Church Street, Ann Arbor, MI 48109 (United States)
  2. University of Chicago, Kavli Institute for Cosmological Physics, 5640 South Ellis Avenue, Chicago, IL 60637 (United States)
  3. Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, 85748 Garching (Germany)

Peculiar velocities of objects in the nearby universe are correlated due to the gravitational pull of large-scale structure. By measuring these velocities, we have a unique opportunity to test the cosmological model at the lowest redshifts. We perform this test, using current data to constrain the amplitude of the ''signal'' covariance matrix describing the velocities and their correlations. We consider a new, well-calibrated ''Supercal'' set of low-redshift SNe Ia as well as a set of distances derived from the fundamental plane relation of 6dFGS galaxies. Analyzing the SN and galaxy data separately, both results are consistent with the peculiar velocity signal of our fiducial ΛCDM model, ruling out the noise-only model with zero peculiar velocities at greater than 7σ (SNe) and 8σ (galaxies). When the two data sets are combined appropriately, the precision of the test increases slightly, resulting in a constraint on the signal amplitude of A = 1.05{sub −0.21}{sup +0.25}, where A = 1 corresponds to our fiducial model. Equivalently, we report an 11% measurement of the product of the growth rate and amplitude of mass fluctuations evaluated at z {sub eff} = 0.02, f σ{sub 8} = 0.428{sub −0.045}{sup +0.048}, valid for our fiducial ΛCDM model. We explore the robustness of the results to a number of conceivable variations in the analysis and find that individual variations shift the preferred signal amplitude by less than ∼0.5σ. We briefly discuss our Supercal SN Ia results in comparison with our previous results using the JLA compilation.

OSTI ID:
22676225
Journal Information:
Journal of Cosmology and Astroparticle Physics, Vol. 2017, Issue 05; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
Country of Publication:
United States
Language:
English

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(An)isotropy of the Hubble diagram: comparing hemispheres text January 2007
Science With The Australian Square Kilometre Array Pathfinder text January 2007
The effect of peculiar velocities on supernova cosmology text January 2010
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Searching for a preferred direction with Union2.1 data text January 2013
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Probing the isotropy of cosmic acceleration traced by Type Ia supernovae text January 2015
Hyper-Fit: Fitting Linear Models to Multidimensional Data with Multivariate Gaussian Uncertainties text January 2015
Consistent beta values from density-density and velocity-velocity comparisons text January 2002
The 6dF Galaxy Survey: Samples, Observational Techniques and the First Data Release text January 2004
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Cited By (36)

Dark energy two decades after: observables, probes, consistency tests journal December 2017
Optimising growth of structure constraints on modified gravity journal June 2019
Power spectrum multipoles on the curved sky: an application to the 6-degree Field Galaxy Survey journal July 2018
The redshift-space momentum power spectrum – I. Optimal estimation from peculiar velocity surveys journal May 2019
The redshift-space momentum power spectrum – II. Measuring the growth rate from the combined 2MTF and 6dFGSv surveys journal June 2019
Observational constraints on the oscillating dark energy cosmologies journal February 2019
Can dark energy be expressed as a power series of the Hubble parameter? journal July 2019
Designing Horndeski and the effective fluid approach journal September 2019
Growth of matter perturbations in the bi-Galileons field model journal December 2019
Complementarity of peculiar velocity surveys and redshift space distortions for testing gravity journal January 2020
Perturbation level interacting dark energy model and its consequence on late-time cosmological parameters journal February 2020
Tension and constraints on modified gravity parametrizations of G eff ( z ) from growth rate and Planck data journal July 2017
Conjoined constraints on modified gravity from the expansion history and cosmic growth journal September 2017
Cosmological constraints and comparison of viable f ( R ) models journal January 2018
Effective gravitational coupling in modified teleparallel theories journal April 2018
Evolution of the f σ 8 tension with the Planck 15 / Λ CDM determination and implications for modified gravity theories journal May 2018
Internal robustness of growth rate data journal October 2018
Unraveling the effective fluid approach for f ( R ) models in the subhorizon approximation journal February 2019
Constraining power of cosmological observables: Blind redshift spots and optimal ranges journal March 2019
Ginzburg-Landau theory of dark energy: A framework to study both temporal and spatial cosmological tensions simultaneously journal April 2019
Percent-Level Test of Isotropic Expansion Using Type Ia Supernovae journal March 2019
Hints of modified gravity in cosmos and in the lab? journal April 2019
The Complete Light-curve Sample of Spectroscopically Confirmed SNe Ia from Pan-STARRS1 and Cosmological Constraints from the Combined Pantheon Sample journal May 2018
Statistical inconsistencies in the KiDS-450 data set journal January 2018
Statistical Inconsistencies in the KiDS-450 Dataset text January 2017
Dark energy two decades after: Observables, probes, consistency tests text January 2017
Power spectrum multipoles on the curved sky: an application to the 6-degree Field Galaxy Survey text January 2018
Effective gravitational coupling in modified teleparallel theories text January 2018
Ginzburg-Landau Theory of Dark Energy: A Framework to Study Both Temporal and Spatial Cosmological Tensions Simultaneously text January 2018
Constraining power of cosmological observables: blind redshift spots and optimal ranges text January 2018
Observational constraints on the oscillating dark energy cosmologies text January 2019
Percent-Level Test of Isotropic Expansion Using Type Ia Supernovae text January 2019
The Redshift-Space Momentum Power Spectrum I: Optimal Estimation From Peculiar Velocity Surveys text January 2019
Complementarity of Peculiar Velocity Surveys and Redshift Space Distortions for Testing Gravity text January 2019
Perturbation level interacting dark energy model and its consequence on late-time cosmological parameters text January 2020
Probing the independence within the dark sector in the fluid approximation journal December 2019

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