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Observations of Type Ia Supernovae (SNe Ia) have provided key evidence for the accelerated expansion of the universe. However, analyses of the Pantheon+ dataset reveal anisotropies–specifically, a dipolar anisotropy in the Hubble parameter and a scale-dependent dipolar anisotropy in the deceleration parameter. Notably, the dipolar anisotropy in the deceleration parameter is consistent with general relativistic predictions for the effects of a bulk flow surrounding the observer, offering an alternative explanation to dark energy for the observed cosmic acceleration.

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Examining the Cosmic Anisotropy with the Pantheon+ Supernovae

  • 会议论文

  • 发表日期：

    2025年

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  • Animesh Sah

摘要

Observations of Type Ia Supernovae (SNe Ia) have provided key evidence for the accelerated expansion of the universe. However, analyses of the Pantheon+ dataset reveal anisotropies–specifically, a dipolar anisotropy in the Hubble parameter and a scale-dependent dipolar anisotropy in the deceleration parameter. Notably, the dipolar anisotropy in the deceleration parameter is consistent with general relativistic predictions for the effects of a bulk flow surrounding the observer, offering an alternative explanation to dark energy for the observed cosmic acceleration.