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Anisotropy in Pantheon+ supernovae

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arxiv 2411.10838 v2 pith:GHGI6B4G submitted 2024-11-16 astro-ph.CO gr-qchep-ph

Animesh Sah , Mohamed Rameez , Subir Sarkar , Christos Tsagas This is my paper
classification astro-ph.COgr-qchep-ph
keywords framecataloguedipolarexpansionhubblelocalpantheonparameter
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We employ Maximum Likelihood Estimators to examine the Pantheon+ catalogue of Type Ia supernovae for large scale anisotropies in the expansion rate of the Universe. The analyses are carried out in the heliocentric frame, the CMB frame, as well as the Local Group frame. In all frames, the Hubble expansion rate in the redshift range 0.023 < z < 0.15 is found to have a statistically significant dipolar variation exceeding 1.5 km/s/Mpc, i.e. bigger than the claimed 1% uncertainty in the SH0ES measurement of the Hubble parameter H_0. The deceleration parameter too has a redshift-dependent dipolar modulation at > 5 sigma significance, consistent with previous findings using the SDSSII/SNLS3 Joint Lightcurve Analysis catalogue. The inferred cosmic acceleration cannot therefore be due to a Cosmological Constant, but is likely a general relativistic effect due to the anomalous bulk flow in our local Universe.

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Cited by 5 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. A Quantitative Framework for Testing the Hubble Tension in a Bianchi Type I Cosmological Background

    astro-ph.CO 2026-07 conditional novelty 6.0 of 10

    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.

  2. Expected redshift drift for tilted observers

    astro-ph.CO 2026-05 unverdicted novelty 6.0 of 10

    Redshift drift for tilted observers consists of an FLRW background term plus directional corrections from peculiar expansion, projected shear, and acceleration along the line of sight.

  3. Covariant cosmography in the presence of local structures: comparing exact solutions and perturbation theory

    astro-ph.CO 2025-10 conditional novelty 6.0 of 10

    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.

  4. Response to: "Isotropic deceleration and near-zero baseline acceleration in Pantheon+ supernovae: new arguments in the dark energy debate''

    astro-ph.CO 2026-08 accept novelty 4.0 of 10

    Ray et al. treated the CMB dipole's Galactic coordinates (264°,48°) as Equatorial, so their Pantheon+ hemisphere split (724/840) was not dipole-aligned; the correct ICRS dipole (167.8°,−7.1°) gives 539/1025.

  5. Constraints on transition redshift utilizing the latest H(z) measurements and comments on the Hubble tension

    astro-ph.CO 2025-08 conditional novelty 4.0 of 10

    A meta-analysis of published transition-redshift constraints finds z_tr ≈ 0.65, which the authors suggest overlaps with the redshift where the Hubble tension begins.

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