Superhorizon Perturbations: A Possible Explanation of the Hubble-Lema tre Tension and the Large-scale Anisotropy of the Universe

Prabhakar Tiwari; Rahul Kothari; Pankaj Jain

doi:10.3847/2041-8213/ac447a

Superhorizon Perturbations: A Possible Explanation of the Hubble-Lema tre Tension and the Large-scale Anisotropy of the Universe

Prabhakar Tiwari, Rahul Kothari, Pankaj Jain

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

Current cosmological observations point to a serious discrepancy between the observed Hubble parameter obtained using direct versus cosmic microwave background radiation measurements. Besides this so-called Hubble-Lemaitre tension, we also find considerable evidence in diverse cosmological observables that indicate violation of the cosmological principle. In this paper, we suggest that both these discrepancies are related and can be explained by invoking superhorizon perturbations in the universe. We implement this by considering a single superhorizon mode and showing that it leads to both a dipole in large-scale structures and a shift in the Hubble-Lemaitre parameter. Furthermore, the shift is found to be independent of redshift up to a certain distance. This is nicely consistent with the data.

Original language	English
Article number	L36
Journal	Astrophysical Journal Letters
Volume	924
Issue number	2
DOIs	https://doi.org/10.3847/2041-8213/ac447a
State	Published - 10 Jan 2022
Externally published	Yes

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title = "Superhorizon Perturbations: A Possible Explanation of the Hubble-Lema tre Tension and the Large-scale Anisotropy of the Universe",

abstract = "Current cosmological observations point to a serious discrepancy between the observed Hubble parameter obtained using direct versus cosmic microwave background radiation measurements. Besides this so-called Hubble-Lemaitre tension, we also find considerable evidence in diverse cosmological observables that indicate violation of the cosmological principle. In this paper, we suggest that both these discrepancies are related and can be explained by invoking superhorizon perturbations in the universe. We implement this by considering a single superhorizon mode and showing that it leads to both a dipole in large-scale structures and a shift in the Hubble-Lemaitre parameter. Furthermore, the shift is found to be independent of redshift up to a certain distance. This is nicely consistent with the data.",

author = "Prabhakar Tiwari and Rahul Kothari and Pankaj Jain",

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AU - Kothari, Rahul

AU - Jain, Pankaj

PY - 2022/1/10

Y1 - 2022/1/10

N2 - Current cosmological observations point to a serious discrepancy between the observed Hubble parameter obtained using direct versus cosmic microwave background radiation measurements. Besides this so-called Hubble-Lemaitre tension, we also find considerable evidence in diverse cosmological observables that indicate violation of the cosmological principle. In this paper, we suggest that both these discrepancies are related and can be explained by invoking superhorizon perturbations in the universe. We implement this by considering a single superhorizon mode and showing that it leads to both a dipole in large-scale structures and a shift in the Hubble-Lemaitre parameter. Furthermore, the shift is found to be independent of redshift up to a certain distance. This is nicely consistent with the data.

AB - Current cosmological observations point to a serious discrepancy between the observed Hubble parameter obtained using direct versus cosmic microwave background radiation measurements. Besides this so-called Hubble-Lemaitre tension, we also find considerable evidence in diverse cosmological observables that indicate violation of the cosmological principle. In this paper, we suggest that both these discrepancies are related and can be explained by invoking superhorizon perturbations in the universe. We implement this by considering a single superhorizon mode and showing that it leads to both a dipole in large-scale structures and a shift in the Hubble-Lemaitre parameter. Furthermore, the shift is found to be independent of redshift up to a certain distance. This is nicely consistent with the data.

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Superhorizon Perturbations: A Possible Explanation of the Hubble-Lema tre Tension and the Large-scale Anisotropy of the Universe

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