A structured analysis of Hubble tension

Beenakker, Wim; Venhoek, David

doi:10.48550/arxiv.2101.01372

Cited by 12 publications

(14 citation statements)

References 34 publications

(43 reference statements)

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“…where we have labelled the kinematic variables associated with k µ by a hat and the kinematic variables associated with l µ by a tilde. 5 It shall furthermore be useful to also define the analogous expansion tensor and kinematic variables associated with e µ (labelled by a bar):…”

Section: Foliation Of the Past Null Cone And Light Frontsmentioning

confidence: 99%

“…Far away from the vertex, the use of λ as a meaningful foliation scalar must be carefully re-assessed. 5 As a result of the fact that l µ does not in general generate a geodesic null congruence, it does not in general satisfy the condition (6). For the same reason, l µ is not necessarily hypersurface-forming.…”

Section: Foliation Of the Past Null Cone And Light Frontsmentioning

confidence: 99%

“…The ΛCDM model (Cold Dark Matter including a cosmological constant Λ) is a particular general relativistic FLRW metric model, with ordinary matter, radiation, dark matter (CDM), and dark energy (modelled with Λ) as energy-momentum sources. The ΛCDM paradigm has proven successful in a largely consistent interpretation of observational data; however, with a number of 'tensions' remaining [28,81,119,5,39,110]. Importantly, the success of the ΛCDM framework comes at the price of introducing dark components to the cosmological energy budget [2].…”

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confidence: 99%

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The averaging problem on the past null cone in inhomogeneous dust cosmologies

Buchert¹,

Elst²,

Heinesen³

2022

Preprint

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We investigate average properties of light fronts as they propagate from a finite patch of a source (e.g., the last scattering surface) to a finite patch of a telescope pointing in generic irrotational dust cosmologies. In this setting we formulate Einstein's field equations on the light fronts and provide constraint equations and propagation equations along an observer's past null cone. For the resulting covariant system of area-averaged equations on the light fronts, we discuss integralgeometric properties together with closure conditions for the underdetermined set of equations. We formulate light front averages of observable quantities, including the effective angular diameter distance and the cosmological redshift drift. The 'backreaction' in the effective angular diameter distance is quantified in terms of cosmological area-averaged variables on the screen space of observation, as well as a 'memory function' containing information on the auto-correlation of the expansion rate of an incoming geodesic null ray bundle along the observer's past null cone.

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Section: Foliation Of the Past Null Cone And Light Frontsmentioning

confidence: 99%

Section: Foliation Of the Past Null Cone And Light Frontsmentioning

confidence: 99%

mentioning

confidence: 99%

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The averaging problem on the past null cone in inhomogeneous dust cosmologies

Buchert¹,

Elst²,

Heinesen³

2022

Preprint

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“…The reaction to the cosmological tension has been varied with numerous proposals for solutions [20,21] with a large portion of the community still seeking some systematics source to the cosmological tensions problem. However, these efforts are diminished with every new data release.…”

Section: Introductionmentioning

confidence: 99%

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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“…The Hubble tension as the claimed discrepancy between the values of the Hubble parameter associated to the early and late Universe treatments, is attracting much attention [1,2,3,4,5,6,7,8,9]. The key issue is whether it is a signature of principally new physical concepts or outlines the need of more accurate observational data analysis and interpretation within the existing concepts.…”

Section: Introductionmentioning

confidence: 99%

Hubble tension vs two flows

Gurzadyan,

Stepanian

2021

Preprint

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The Hubble tension is shown to be solvable, without any free parameter, conceptually and quantitatively, within the approach of modified weak-field General Relativity involving the cosmological constant Λ. That approach enables one to describe in a unified picture both the dynamics of dark matter containing galaxies and the accelerated expansion of the Universe, thus defining a local Hubble constant of a local flow and the global one. The data on the dark matter content of peculiar galaxy samples are shown to be compatible to that unified picture. Future more refined surveys of galaxy distribution, hierarchical dynamics and flows within the vicinity of the Local group and the Virgo supercluster can be decisive in revealing the possible common nature of the dark sector.

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A structured analysis of Hubble tension

Cited by 12 publications

References 34 publications

The averaging problem on the past null cone in inhomogeneous dust cosmologies

The averaging problem on the past null cone in inhomogeneous dust cosmologies

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

Hubble tension vs two flows

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