Hubble Law: Measure and Interpretation

Paturel, G.; Teerikorpi, P.; Baryshev, Yu. V.

doi:10.1007/s10701-017-0093-4

Cited by 11 publications

(9 citation statements)

References 58 publications

(61 reference statements)

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“…as proposed previously [51]. Interestingly, according to eqn 21, if the age of HD140283 is assumed to provide a fair estimate for T f , with H 0 ≈ 70 km/s/Mpc [24,75,76,77], the oldest objects at z ≈ 4 are expected to have an age of T obs (4) ≈ 2.8 Gyr, in good agreement with the measured age of APM 08279+5255. Note that it has been claimed that ΛCDM can hardly cope with the estimated age of APM 08279+5255 [90,93,94,95].…”

Section: Old High Redshift Objectssupporting

confidence: 82%

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A framework for the next generation of stationary cosmological models

Sanejouand

2020

Preprint

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According to a generic tired-light hypothesis found consistent with H(z) data, the density number of galaxies has been nearly constant over the last 10 Gyr at least, the density number of star-forming galaxies, as probed by sources of gamma-ray bursts, being constant as well, meaning that, as far as galaxies are concerned, the Universe has been stationary. On the other hand, an analysis of the luminosity distances of quasars and supernovae Ia shows that the Universe is far from being as transparent as assumed nowadays, the photon lifetime along the line-of-sight being one third of the Hubble time.

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Section: Old High Redshift Objectssupporting

confidence: 82%

“…Thus, with H 0 ≈ 70 km/s/Mpc [24,75,76,77], σ G ≈ 5 10 41 m 2 , the corresponding radius being of ≈ 2 10 20 m, which is indeed the order of magnitude of the radius of a galaxy.…”

Section: The Photon Lifetimementioning

confidence: 99%

A framework for the next generation of stationary cosmological models

Sanejouand

2020

Preprint

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“…The redshifts of the 300 GRBs considered were sorted by increasing values, so as to build 12 groups of 25 GRBs, the GRBs of each group having redshifts belonging to a given range, namely: Figure 1 shows the density of GRB sources observed by Swift for each of these 12 ranges, as obtained using eqn (7). It is found to be fairly constant up to z ≈ 4, with ρ M (z i , z j ) = 1.8 ± 0.5 GRB sources per Gpc 3 , if H 0 = 73 km.s −1 .Mpc −1 [26,27].…”

Section: Resultsmentioning

confidence: 99%

Has the density of sources of gamma-ray burts been constant over the last ten billion years ?

Sanejouand¹

2018

Preprint

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A generic tired-light mechanism is examined in which a photon, like any particle moving in a medium, experiences friction, that is, a force resisting its motion. If the velocity of light is assumed to be constant, this hypothesis yields a Hubble-like law which is also a consequence of the R h = ct cosmology. Herein, it is used for estimating matter density as a function of redshift, allowing to show that the density of sources of long gammaray bursts appears to be nearly constant, up to z ≈ 4. Assuming that the later is a fair probe of the former, this means that matter density has been roughly constant over the last ten billion years, implying that, at least over this period, matter has been in an overall state of equilibrium.

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“…H 0 is the slope of the line in the Hubble-Lemaître Law, relating the recession velocity of a galaxy to the distance that it is from an observer. A representation of this law can be seen in Figure 1, obtained from Paturel et al [3]. In other words, H 0 relates to the expansion of the Universe on cosmic scales and is named after Edwin Hubble who discovered it in 1929 when he realized that galaxies' velocities away from an observer are directly proportional to their distance from that observer, except for cases of peculiar velocities [4].…”

Section: Hubble's Constant (H 0 )mentioning

confidence: 99%

A Chi-Squared Analysis of the Measurements of Two Cosmological Parameters over Time

Faerber

López-Corredoira

2020

Universe

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The aim of this analysis was to determine whether or not the given error bars truly represented the dispersion of values in a historical compilation of two cosmological parameters: the amplitude of mass fluctuations (σ8) and Hubble’s constant (H0) parameters in the standard cosmological model. For this analysis, a chi-squared test was executed on a compiled list of past measurements. It was found through analysis of the chi-squared (χ2) values of the data that for σ8 (60 data points measured between 1993 and 2019 and χ2 between 182.4 and 189.0) the associated probability Q is extremely low, with Q=1.6×10−15 for the weighted average and Q=8.8×10−15 for the best linear fit of the data. This was also the case for the χ2 values of H0 (163 data points measured between 1976 and 2019 and χ2 between 480.1 and 575.7), where Q=1.8×10−33 for the linear fit of the data and Q=1.0×10−47 for the weighted average of the data. The general conclusion was that the statistical error bars associated with the observed parameter measurements have been underestimated or the systematic errors were not properly taken into account in at least 20% of the measurements. The fact that the underestimation of error bars for H0 is so common might explain the apparent 4.4σ discrepancy formally known today as the Hubble tension.

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Hubble Law: Measure and Interpretation

Cited by 11 publications

References 58 publications

A framework for the next generation of stationary cosmological models

A framework for the next generation of stationary cosmological models

Has the density of sources of gamma-ray burts been constant over the last ten billion years ?

A Chi-Squared Analysis of the Measurements of Two Cosmological Parameters over Time

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