Does Hubble tension signal a breakdown in FLRW cosmology?

Krishnan, Chethan; Mohayaee, Roya; Colgáin, Eoin Ó; Sheikh-Jabbari, M. M.; Yin, Lu

doi:10.1088/1361-6382/ac1a81

Cited by 133 publications

(81 citation statements)

References 132 publications

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“…In recent years, great efforts have been made towards solving the H 0 tension, see e.g. [11][12][13][14][15][16][17][18][19][20][21][22][23][24], as well as the σ 8 tension, see e.g. [10,[25][26][27][28][29][30][31][32][33][34] (see also [35][36][37][38][39][40] for an overview of observations and models).…”

Section: Introductionmentioning

confidence: 99%

Can late-time extensions solve the $H_0$ and $σ_8$ tensions?

Heisenberg¹,

Villarrubia-Rojo²,

Zosso³

2022

Preprint

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We analyze the properties that any late-time modification of the ΛCDM expansion history must have in order to consistently solve both the H0 and the σ8 tensions. Taking a model-independent approach, we obtain a set of necessary conditions that can be applied to generic late-time extensions. Our results are fully analytical and merely based on the assumptions that the deviations from the ΛCDM background remain small. For the concrete case of a dark energy fluid with equation of state w(z), we derive the following general requirements: (i) Solving the H0 tension demands w(z) < −1 at some z (ii) Solving both the H0 and σ8 tensions requires w(z) to cross the phantom divide. Finally, we also allow for small deviations on the effective gravitational constant. In this case, our method is still able to constrain the functional form of these deviations. Contents

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Section: Introductionmentioning

confidence: 99%

Can late-time extensions solve the $H_0$ and $σ_8$ tensions?

Heisenberg¹,

Villarrubia-Rojo²,

Zosso³

2022

Preprint

View full text Add to dashboard Cite

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“…In the most recent reporting, ΛCDM has shown to be in an excellent agreement with measurements of the cosmic microwave background (CMB) radiation, the abundances of elements in the early Universe, the large scale structure of the Universe and other major astronomical measurables [1][2][3][4]. While foundational problems persist in ΛCDM such as the nature of dark matter and dark energy, as well as long-standing theoretical issues in general relativity (GR) [5], the fortitude of the concordance model has prompted new questions in the foundations of basic cosmological principles [6].…”

Section: Introductionmentioning

confidence: 84%

On the Robustness of the Constancy of the Supernova Absolute Magnitude: Non-parametric Reconstruction \& Bayesian approaches

Benisty¹,

Mifsud²,

Said³

et al. 2022

Preprint

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In this work, we test the robustness of the constancy of the Supernova absolute magnitude MB using Non-parametric Reconstruction Techniques (NRT). We isolate the luminosity distance parameter dL(z) from the Baryon Acoustic Oscillations (BAO) data set and cancel the expansion part from the observed distance modulus µ(z). Consequently, the degeneracy between the absolute magnitude with the Hubble constant H0, is replaced by a degeneracy with the sound horizon at drag epoch r d . When imposing the r d value, this yields the MB(z) = MB + δMB(z) value from NRT. We perform the respective reconstructions using the model independent Artificial Neural Network (ANN) technique and Gaussian processes (GP) regression. For the ANN we infer MB = −19.22 ± 0.20, and for the GP we get MB = −19.25 ± 0.39 when using the sound horizon from late time measurements. These estimations provide a 1 σ possibility of a nuisance parameter presence δMB(z) at higher redshifts. We also tested different known nuisance models with the Markov Chain Monte Carlo (MCMC) technique which showed a strong preference for the constant model, but it was not possible not single out a best fit nuisance model.

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“…In Equation (1), t(z) receives most of its contribution at late times (z ≤ 10), and is scarcely sensitive to prerecombination physics. Therefore, consistency between the high-z upper limits on H 0 and the local H 0 measurements offers a stringent test of late-time and/or local new physics, potentially suggesting the necessity for the latter to operate together with early-time new physics to completely address the Hubble tension (Krishnan et al 2020(Krishnan et al , 2021aDainotti et al 2021;Jedamzik et al 2021;Lin et al 2021;Vagnozzi 2021;Vagnozzi et al 2021b).…”

Section: The Age-redshift Testmentioning

confidence: 99%

Exploring the Hubble Tension and Spatial Curvature from the Ages of Old Astrophysical Objects

Wei,

Melia

2022

Preprint

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We use the age measurements of 114 old astrophysical objects (OAO) in the redshift range 0 z 8 to explore the Hubble tension. The age of the Universe at any z is inversely proportional to the Hubble constant, H 0 , so requiring the Universe to be older than the OAO it contains at any z will lead to an upper limit on H 0 . Assuming flat ΛCDM and setting a Gaussian prior on the matter density parameter Ω m = 0.315 ± 0.007 informed by Planck, we obtain a 95% confidence-level upper limit of H 0 < 70.6 km s −1 Mpc −1 , representing a 2σ tension with the measurement using the local distance ladder. We find, however, that the inferred upper limit on H 0 depends quite sensitively on the prior for Ω m , and the Hubble tension between early-time and local measurements of H 0 may be due in part to the inference of both Ω m and H 0 in Planck, while the local measurement uses only H 0 . The age-redshift data may also be used for cosmological model comparisons. We find that the R h = ct universe accounts well for the data, with a reasonable upper limit on H 0 , while Einstein-de Sitter fails to pass the cosmic-age test. Finally, we present a model-independent estimate of the spatial curvature using the ages of 61 galaxies and the luminosity distances of 1,048 Pantheon Type Ia supernovae. This analysis suggests that the geometry of the Universe is marginally consistent with spatial flatness at a confidence level of 1.6σ, characterized as Ω k = 0.43 +0.27 −0.27 .

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Does Hubble tension signal a breakdown in FLRW cosmology?

Cited by 133 publications

References 132 publications

Can late-time extensions solve the $H_0$ and $σ_8$ tensions?

Can late-time extensions solve the $H_0$ and $σ_8$ tensions?

On the Robustness of the Constancy of the Supernova Absolute Magnitude: Non-parametric Reconstruction \& Bayesian approaches

Exploring the Hubble Tension and Spatial Curvature from the Ages of Old Astrophysical Objects

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