Interacting Dark Sectors in Anisotropic Universe: Observational Constraints and $H_{0}$ Tension

Amirhashchi, Hassan; Yadav, Anil Kumar

doi:10.48550/arxiv.2001.03775

Cited by 13 publications

(13 citation statements)

References 73 publications

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“…In Ref. [639], a coupling between the dark components within an anisotropic Bianchi type I Universe is considered. A fit of this model to Planck 2018 + CC data gives H 0 = 65.82 +0.…”

Section: Interaction In the Anisotropic Universementioning

confidence: 99%

In the Realm of the Hubble tension $-$ a Review of Solutions

Di Valentino,

Mena,

Pan

et al. 2021

Preprint

178

252

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The simplest ΛCDM model provides a good fit to a large span of cosmological data but harbors large areas of phenomenology and ignorance. With the improvement of the number and the accuracy of observations, discrepancies among key cosmological parameters of the model have emerged. The most statistically significant tension is the 4σ to 6σ disagreement between predictions of the Hubble constant, H 0 , made by the early time probes in concert with the "vanilla" ΛCDM Cosmological model, and a number of late time, model-independent determinations of H 0 from local measurements of distances and redshifts. The high precision and consistency of the data at both ends present strong challenges to the possible solution space and demands a hypothesis with enough rigor to explain multiple observations-whether these invoke new physics, unexpected large-scale structures or multiple, unrelated errors. A thorough review of the problem including a discussion of recent Hubble constant estimates and a summary of the proposed theoretical solutions is presented here. We include more than 850 references, indicating that the interest in this area has grown considerably just during the last few years. We classify the many proposals to resolve the tension in these categories: Early Dark Energy, Late Dark Energy, Dark energy models with 6 degrees of freedom and their extensions, Models with extra relativistic degrees of freedom, Models with Extra Interactions, Unified cosmologies, Modified gravity, Inflationary models, Modified recombination history, Physics of the critical Phenomena, and Alternative proposals. Some are formally successful, improving the fit to the data in light of their additional degrees of freedom, restoring agreement within 1 − 2σ between Planck 2018, using the Cosmic Microwave Background power spectra data, Baryon Acoustic Oscillations, Pantheon SN data, and R20, the latest SH0ES Team [2] measurement of the Hubble constant (H 0 = 73.2 ± 1.3 km s −1 Mpc −1 at 68% confidence level). However, there are many more unsuccessful models which leave the discrepancy well above the 3σ disagreement level. In many cases, reduced tension comes not simply from a change in the value of H 0 but also due to an increase in its uncertainty due to degeneracy with additional physics, complicating the picture and pointing to the need for additional probes. While no specific proposal makes a strong case for being highly likely or far better than all others, solutions involving early or dynamical dark energy, neutrino interactions, interacting cosmologies, primordial magnetic fields, and modified gravity provide the best options until a better alternative comes along.

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“…In Ref. [639], a coupling between the dark components within an anisotropic Bianchi type I Universe is considered. A fit of this model to Planck 2018 + CC data gives H 0 = 65.82 +0.…”

Section: Interaction In the Anisotropic Universementioning

confidence: 99%

In the Realm of the Hubble tension $-$ a Review of Solutions

Di Valentino,

Mena,

Pan

et al. 2021

Preprint

178

252

View full text Add to dashboard Cite

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“…Such an approach is studied for an "effective" curvature type contribution arising from matter clumping in [28]. Approaches based on more explicit breaking of isotropy can be found in [29].…”

Section: Subverting the Spatially Flat Frw Frameworkmentioning

confidence: 99%

A structured analysis of Hubble tension

Beenakker,

Venhoek

2021

Preprint

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As observations of the Hubble parameter from both early and late sources have improved, the tension between these has increased to be well above the 5σ threshold. Given this, the need for an explanation of such a tension has grown. In this paper, we explore a set of 7 assumptions, and show that, in order to alleviate the Hubble tension, a model needs to break at least one of these 7, providing a quick and easy to apply check for new model proposals. We also use this framework to make a rough categorisation of current proposed models, and show the existence of at least one under-explored avenue of alleviating the Hubble tension.

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“…It has been shown that some of the interacting dynamical dark energy models available on the market could be employed to solve the issue. But also, a modification of General Relativity may well lead to other solutions [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] (to mention some references).…”

Section: Introductionmentioning

confidence: 99%

An approach to cold dark matter deviation and the $H_{0}$ tension problem by using machine learning

Elizalde,

Gluza,

Khurshudyan

2021

Preprint

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In this work, two different models, one with cosmological constant Λ, and baryonic and dark matter (with ω dm = 0), and the other with an X dark energy (with ω de = −1), and baryonic and dark matter (with ω dm = 0), are investigated and compared. Using Bayesian machine learning analysis, constraints on the free parameters of both models are obtained for the three redshift ranges: z ∈ [0, 2], z ∈ [0, 2.5], and z ∈ [0, 5], respectively. For the first two redshift ranges, high-quality observations of the expansion rate H(z) exist already, and they are used for validating the fitting results. Additionally, the extended range z ∈ [0, 5] provides predictions of the model parameters, verified when reliable higher-redshift H(z) data are available. This learning procedure, based on the expansion rate data generated from the background dynamics of each model, shows that, at cosmological scales, there is a deviation from the cold dark matter paradigm, ω dm = 0, for all three redshift ranges. The results show that this approach may qualify as a solution to the H0 tension problem. Indeed, it hints at how this issue could be effectively solved (or at least alleviated) in cosmological models with interacting dark energy.

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Interacting Dark Sectors in Anisotropic Universe: Observational Constraints and $H_{0}$ Tension

Cited by 13 publications

References 73 publications

In the Realm of the Hubble tension $-$ a Review of Solutions

In the Realm of the Hubble tension $-$ a Review of Solutions

A structured analysis of Hubble tension

An approach to cold dark matter deviation and the $H_{0}$ tension problem by using machine learning

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