Journal article

Pantheon + supernovae corrected for progenitor age indicate the universe is decelerating

Abstract:: We examine the impact of progenitor age-dependent luminosity evolution of Type Ia supernovae on a cosmographic measurement of the deceleration parameter . Our recent redshift tomographic analysis showed that locally has a strong dipole anisotropy aligned approximately with the bulk flow, and only a small monopole component remains at distances exceeding a few hundred Mpc. Applying redshift-dependent corrections for progenitor age to the Pantheon + catalogue, we find that this shifts the monopole component of to positive values (i.e. deceleration) while leaving the local dipole component essentially unchanged.

Publication status:: Published

Peer review status:: Peer reviewed

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APA Style

Sah, A., Rameez, M., & Sarkar, S. (2026). Pantheon + supernovae corrected for progenitor age indicate the universe is decelerating. Monthly Notices of the Royal Astronomical Society, 549(3).

MLA Style

Sah, A, et al. “Pantheon + Supernovae Corrected for Progenitor Age Indicate the Universe Is Decelerating.” Monthly Notices of the Royal Astronomical Society, vol. 549, no. 3, 2026.

Chicago Style

Sah, A, M Rameez, and S Sarkar. 2026. “Pantheon + Supernovae Corrected for Progenitor Age Indicate the Universe Is Decelerating.” Monthly Notices of the Royal Astronomical Society 549 (3).
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Files:: Sah_et_al_2026_Pantheon_+_supernovae.pdf

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Publisher copy:: 10.1093/mnras/stag844

Authors

+ Sah, A More by this author

Role:: Author
ORCID:: 0000-0001-9541-916X

+ Rameez, M More by this author

Role:: Author
ORCID:: 0000-0001-5023-5631

+ Sarkar, S More by this author

Institution:: University of Oxford
Division:: MPLS
Department:: Physics
Sub department:: Theoretical Physics
Role:: Author
ORCID:: 0000-0002-3542-858X

+ Tata Institute of Fundamental Research More from this funder

Funder identifier:: https://ror.org/03ht1xw27

Publisher:: Oxford University Press
Journal:: Monthly Notices of the Royal Astronomical Society More from this journal
Volume:: 549
Issue:: 3
Article number:: stag844
Publication date:: 2026-06-11
Acceptance date:: 2026-04-30
DOI:: 10.1093/mnras/stag844
EISSN:: 1365-2966
ISSN:: 0035-8711

Language:: English
Keywords:: supernovae: general

dark energy

cosmology: observations

cosmological parameters
Source identifiers:: 4223701
Deposit date:: 2026-06-11
ARK identifier:: ark:/29072/ora_9c34260842944e839973bcd72c7abadb

Terms of use

Copyright date:: 2026

Licence:: CC Attribution (CC BY)

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