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June 14, 2026Monthly Notices of the Royal Astronomical Society0 citationsOpen Access

Impact of Progenitor Age on Type Ia Supernovae and Universe Deceleration

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

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Authors

ASAnimesh SahMRMohamed RameezSSSubir Sarkar

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Overview

This research examines how progenitor age-adjusted supernovae luminosity affects the deceleration parameter in cosmology, suggesting a decelerating universe.

Key Points

  • The study aims to understand how the age of supernova progenitors affects measurements of the universe's deceleration parameter.
  • Utilized redshift tomographic analysis to assess the deceleration parameter $q_0$.
  • Applied redshift-dependent corrections for progenitor age to the Pantheon + catalogue.
  • Analyzed the monopole and dipole components of $q_0$ across various distances.
  • The monopole component of $q_0$ shifted to positive values indicating deceleration.
  • The local dipole component of $q_0$ remained largely unchanged at greater distances.
  • Revealed significant dipole anisotropy aligned with the cosmic bulk flow.
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Cite This Study

Sah et al. (2026) studied this question.

synapsesocial.com/papers/6a2e4429b1cc60ccdea8a02dhttps://doi.org/10.1093/mnras/stag844
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  5. 5Reconstructing the cosmic expansion with a generalized q(z) parameterization: a decelerating Universe from late-time constraints2026 · 2 citations