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The Dipole of the Pantheon+SH0ES Data
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abstract
In this paper we determine the dipole in the distance redshift relation from the Pantheon+ data. We find that, while its amplitude roughly agrees with the dipole found in the cosmic microwave background which is attributed to the motion of the solar system with respect to the cosmic rest frame, the direction is different with a significance of slightly more than $3\si$. While the amplitude depends on the lower redshift cutoff, the direction is quite stable. For redshift cuts of order $z_{\rm cut} \simeq 0.05$ and higher, the dipole is no longer detected with high statistical significance. An important r\^ole seems to be played by the redshift corrections for peculiar velocities.
Forward citations
Cited by 5 Pith papers
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A Quantitative Framework for Testing the Hubble Tension in a Bianchi Type I Cosmological Background
An analytic weak-shear Bianchi I calculation bounds the low-redshift luminosity-distance quadrupole to |Aμ(0.15)|≲2.4×10^-11 mag under BBN shear limits, ruling out shear-only resolution of the Hubble tension.
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Covariant cosmography in the presence of local structures: comparing exact solutions and perturbation theory
Off-center observers in a spherical LTB overdensity get accurate cosmographic distances up to δc≈2.5 near the structure, while linear perturbation theory is better beyond ~3Rs; a gauge dictionary links the two.
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Anisotropy in Pantheon+ supernovae
A maximum-likelihood analysis of Pantheon+ supernovae finds a statistically significant dipole in the local Hubble expansion rate and in the deceleration parameter, which the authors interpret as evidence against a co...
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Alleviating the Hubble Tension with a Local Void and Transitions of the Absolute Magnitude
Deep LTB void models with two or three distance-dependent jumps in the supernova absolute magnitude fit Pantheon+ and Planck data well and push the inferred local Hubble constant toward the SH0ES value.
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Redshift Dependence of $H_0$ Dipole in Pantheon+ Supernovae
A dipole in the locally measured Hubble constant appears at 2-3 sigma in the lowest-redshift Pantheon+ supernova bins, points near the Shapley supercluster and CMB dipole, and disappears for higher redshift thresholds.
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