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Hints of FLRW breakdown from supernovae

Krishnan, C and Mohayaee, R and Colgáin, Eà and Sheikh-Jabbari, MM and Yin, L (2022) Hints of FLRW breakdown from supernovae. In: Physical Review D, 105 (6).

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Official URL: https://doi.org/10.1103/PhysRevD.105.063514


A 10 difference in the scale for the Hubble parameter constitutes a clear problem for cosmology. Here, considering angular distribution of type Ia supernovae (SN) within the Pantheon compilation and working within flat ?CDM cosmology, we observe a correlation between higher H0 and the CMB dipole direction, confirming our previous results for strongly lensed quasars Classical Quantum Gravity 38, 184001 (2021)CQGRDG0264-938110.1088/1361-6382/ac1a81. Concretely, we record a ~1 km/s/Mpc variation in H0 at antipodal points on the sky within the Pantheon sample, which is evident in the Low z subsample (z?0.075) and gets enhanced by higher redshift SN. Our work raises the possibility that we may be at the precision required to probe anisotropic Hubble expansions, while providing a concrete prediction for future inferences of H0. © 2022 American Physical Society.

Item Type: Journal Article
Publication: Physical Review D
Publisher: American Physical Society
Additional Information: The copyright for this article belongs to the Authors.
Department/Centre: Division of Physical & Mathematical Sciences > Centre for High Energy Physics
Date Deposited: 21 Jun 2022 05:17
Last Modified: 21 Jun 2022 05:17
URI: https://eprints.iisc.ac.in/id/eprint/73752

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