Journal article
Anisotropy in Pantheon+ supernovae
- Abstract:
- 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−1 Mpc−1 , i.e. bigger than the claimed 1% uncertainty in the SH0ES measurement of the Hubble parameter H0. The deceleration parameter too has a redshift-dependent dipolar modulation at > 5σ 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.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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(Preview, Version of record, pdf, 2.4MB, Terms of use)
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- Publisher copy:
- 10.1140/epjc/s10052-025-14222-w
Authors
- Publisher:
- Springer
- Journal:
- European Physical Journal C More from this journal
- Volume:
- 85
- Issue:
- 5
- Article number:
- 596
- Publication date:
- 2025-05-30
- Acceptance date:
- 2025-04-24
- DOI:
- EISSN:
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1434-6052
- ISSN:
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1434-6044
- Language:
-
English
- Keywords:
- Pubs id:
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2119785
- Local pid:
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pubs:2119785
- Deposit date:
-
2025-04-26
Terms of use
- Copyright holder:
- Sah et al.
- Copyright date:
- 2025
- Rights statement:
- Copyright © 2025, The Author(s). This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
- Licence:
- CC Attribution (CC BY)
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