2025/06/02 by Fortunato, Jéferson A. S., Hipólito-Ricaldi, Wiliam S., Romero, Gustavo E. · 2 citations
#Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)
paper · doi:10.48550/arxiv.2506.01504
The spatial curvature of the Universe remains a central question in modern cosmology. In this work, we explore the potential of localized Fast Radio Bursts (FRBs) as a novel tool to constrain the cosmic curvature parameter Ωk in a cosmological model-independent way. Using a sample of 80 FRBs with known redshifts and dispersion measures, we reconstruct the Hubble parameter H(z) via artificial neural networks, which is then used to obtain angular diameter distances DA(z) through two complementary approaches. First, we derive the comoving distance DC(z) and DA(z) from FRBs without assuming a fiducial cosmological model. Then, the H(z) reconstruction is combined with Baryon Acoustic Oscillation (BAO) measurements to infer DA(z). By comparing the FRB-derived and BAO+FRB-derived DA(z) values, we extract constraints on Ωk under the Friedmann-Lemaître-Robertson-Walker metric. Our results show consistency with a spatially flat Universe within 1σ uncertainties, although a mild preference for negative curvature is observed across both covariance-based and Gaussian analyses. This study highlights the growing relevance of FRBs in precision cosmology and demonstrates their synergy with BAO data as a powerful probe of the large-scale geometry of the Universe.