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

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–Lemaître tension, we also find considerable evidence in diverse cosmological observabl...

Full description

Saved in:
Bibliographic Details
Published in:Astrophysical journal. Letters 2022-01, Vol.924 (2), p.L36
Main Authors: Tiwari, Prabhakar, Kothari, Rahul, Jain, Pankaj
Format: Article
Language:English
Subjects:
Anisotropy
Background radiation
Big Bang theory
Cosmic microwave background
Dark matter
Dipoles
Hubble constant
Hubble-Lemaitre law
Inflationary universe
Large-scale structure of the universe
Parameters
Perturbation
Radiation
Radiation measurement
Red shift
Universe
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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–Lemaître 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–Lemaître parameter. Furthermore, the shift is found to be independent of redshift up to a certain distance. This is nicely consistent with the data.
ISSN:2041-8205
2041-8213
DOI:10.3847/2041-8213/ac447a