2023/12/03 by Bikash R. Dinda, Dinda, Bikash R. · 1 citation
Physics and Astronomy · #Cosmology and Gravitation Theories #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena #Gamma-ray bursts and supernovae #General Relativity and Quantum Cosmology (gr-qc)
paper · pdf · doi:10.48550/arxiv.2312.01393
openalex publication_date 2023/12/03 · openalex created_date 2023/12/06 · openalex updated_date 2026/07/28
This study explores the impact of cosmic curvature on structure formation through general relativistic first-order perturbation theory. We analyze continuity and Euler equations, incorporating cosmic curvature into Einstein equations. Emphasizing late-time dynamics, we investigate matter density contrast evolution in the presence of cosmic curvature, with a specific focus on sub-hubble scales. Solving the evolution equation, we conduct data analysis using cosmic chronometers, baryon acoustic oscillations from Dark Energy Spectroscopic Instrument Data Release 2 (DESI DR2) (including rd constraint from CMB), type Ia supernova observations from Pantheon+ sample, logarithmic growth rate f data and fσ8 data. While constraints on some parameters remain consistent, inclusion of cosmic curvature losens constraints on Ω\rm m0 and σ\rm 8,0 in ΛCDM and w0CDM models. The non-phantom behavior of dark energy proves more favorable in w0CDM model, whereas in CPL model, there is certain evidence for non-phantom behaviour at lower redshift and phantom behaviour at higher redshift. Interestingly, we find certain evidence for non-zero cosmic curvature in ΛCDM model, but no evidence for it in both w0CDM and CPL models, which indirectly proves the non-degeneracy between dynamical dark energy and cosmic curvature.