Anisotropy in Pantheon+ supernovae
Abstrak
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 $$0.023< z < 0.15$$ 0.023 < z < 0.15 is found to have a statistically significant dipolar variation exceeding 1.5 km s $$^{-1}$$ - 1 Mpc $$^{-1}$$ - 1 , i.e. bigger than the claimed 1% uncertainty in the SH0ES measurement of the Hubble parameter $$H_0$$ H 0 . The deceleration parameter too has a redshift-dependent dipolar modulation at $$>5\sigma $$ > 5 σ 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.
Topik & Kata Kunci
Penulis (4)
Animesh Sah
Mohamed Rameez
Subir Sarkar
Christos G. Tsagas
Akses Cepat
PDF tidak tersedia langsung
Cek di sumber asli →- Tahun Terbit
- 2025
- Sumber Database
- DOAJ
- DOI
- 10.1140/epjc/s10052-025-14222-w
- Akses
- Open Access ✓