2025/07/06 by Tonghua Liu, Liu, Tonghua, Xiaolei Li +7 · 11 citations
Physics and Astronomy · #Astronomy and Astrophysical Research #Cosmology and Gravitation Theories #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #Gamma-ray bursts and supernovae
paper · pdf · doi:10.48550/arxiv.2507.04265
openalex publication_date 2025/07/06 · openalex created_date 2025/10/16 · openalex updated_date 2026/07/29
In this work, we investigate a torsion-based cosmological model within the Einstei-Cartan framework, constrained by the latest combined datasets including DESI DR2 BAO, PantheonPlus and DESY5 supernovae, and the full Planck 2018 CMB measurements (temperature, polarization, and joint NPIPE PR4 + ACT DR6 lensing). The torsion parameter is constrained to α= -0.00066 ± 0.00098 with the full dataset combination, consistent with zero at less than 1σ, while yielding a Hubble constant H0 = 68.41 ± 0.32 km/s/Mpc and matter clustering amplitude S8 = 0.812 ± 0.006. The model shows notable potential in alleviating cosmological tensions, reducing the S8 discrepancy with KiDS-1000 from ∼ 2.3σ in ΛCDM to only 0.1σ. Model comparisons based on the Akaike information criterion show consistent improvements across all datasets, with Δ\rm AIC values ranging from -5.68 to -6.62, indicating a statistically preferred fit for the torsion model. These results suggest that the torsion framework provides a physically well-motivated extension to ΛCDM, capable of simultaneously addressing key cosmological tensions while maintaining excellent agreement with diverse observational probes.