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Scolnic, Benjamin

doi:10.2307/j.ctv1q26ncx.11

Cited by 2 publications

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“…Significantly more egregious errors are seen in the first version of the Pantheon compilation on Github [41] wherein peculiar velocity corrections were used to modify the redshifts of SNe Ia all the way up to z 0.2 although no survey has yet gone to such depths so the information required to make such corrections is simply not available. An illustrative example is SN2246, with z cmb = 0.19422 which has been corrected by a peculiar velocity of 444.3 km s −1 .…”

Section: Data Quality Issuesmentioning

confidence: 99%

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Is there really a Hubble tension?

Rameez

Sarkar

2021

Class. Quantum Grav.

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The heliocentric redshifts (z hel) reported for 150 type Ia supernovae in the Pantheon compilation are significantly discrepant from their corresponding values in the JLA compilation. Both catalogues include corrections to the redshifts and magnitudes of the supernovae to account for the motion of the heliocentric frame relative to the ‘CMB rest frame’, as well as corrections for the directionally coherent bulk motion of local galaxies with respect to this frame. The latter is done employing modelling of peculiar velocities which assume the ΛCDM cosmological model but nevertheless provide evidence for residual bulk flows which are discordant with this model (implying that the observed Universe is in fact anisotropic). Until recently such peculiar velocity corrections in the Pantheon catalogue were made at redshifts exceeding 0.2 although there is no data on which to base such corrections. We study the impact of these vexed issues on the 4.4σ discrepancy between the Hubble constant of H 0 = 67.4 ± 0.5 km s−1 Mpc−1 inferred from observations of CMB anisotropies by Planck assuming ΛCDM, and the measurement of H 0 = 73.5 ± 1.4 km s−1 Mpc−1 by the SH0ES project which extended the local distance ladder using type Ia supernovae. Using the same methodology as the latter study we find that for supernovae whose redshifts are discrepant between Pantheon and JLA with Δz hel > 0.0025, the Pantheon redshifts favour H 0 ≃ 72 km s−1 Mpc−1, while the JLA redshifts favour H 0 ≃ 68 km s−1 Mpc−1. Thus the discrepancies between SNe Ia datasets are sufficient to undermine the claimed ‘Hubble tension’. We further note the systematic variation of H 0 by ∼6–9 km s−1 Mpc−1 across the sky seen in multiple datasets, implying that it cannot be measured locally to better than ∼10% in a model-independent manner.

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Section: Data Quality Issuesmentioning

confidence: 99%

“…This issue is now said [41] to have been fixed by not making any peculiar velocity corrections for z > 0.08 in Pantheon. However the impact of this major change on the determination of H 0 or other cosmological parameters [40] has not been documented.…”

Section: Data Quality Issuesmentioning

confidence: 99%

Is there really a Hubble tension?

Rameez

Sarkar

2021

Class. Quantum Grav.

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“…[73,74] and Appendix A of this paper. The pantheon compilation of SN Ia data in the redshift range 0.01 < z < 2.3 is given in Scolnic et al [75]. ,We consider the third data set to be the Baryon Acoustic Oscillation (BAO) data which includes six distinct measurements of the baryon acoustic scale.…”

Section: Observational Constraintsmentioning

confidence: 99%

The Simplest Parametrization of the Equation of State Parameter in the Scalar Field Universe

et al. 2023

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In this paper, we investigate a scalar field cosmological model of accelerating Universe with the simplest parametrization of the equation of state parameter of the scalar field. We use H(z) data, pantheon compilation of SN Ia data and BAO data to constrain the model parameters using the χ2 minimization technique. We obtain the present values of Hubble constant H0 as 66.2−1.34+1.42, 70.7−0.31+0.32 and 67.74−1.04+1.24 for H(z), H(z) + Pantheon and H(z) + BAO respectively. In addition, we estimate the present age of the Universe in a derived model t0=14.38−0.64+0.63 for joint H(z) and pantheon compilation of SN Ia data which has only 0.88σ tension with its empirical value obtained in Plank collaboration. Moreover, the present values of the deceleration parameter q0 come out to be −0.55−0.038+0.031, −0.61−0.021+0.030 and −0.627−0.025+0.022 by bounding the Universe in the derived model with H(z), H(z) + Pantheon compilation of SN Ia and H(z) + BAO data sets, respectively. We also have performed the state-finder diagnostics to discover the nature of dark energy.

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Cited by 2 publications

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Is there really a Hubble tension?

Is there really a Hubble tension?

The Simplest Parametrization of the Equation of State Parameter in the Scalar Field Universe

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