Type: Research Paper
Bibliographic Information: Kalita, S., Bhatporia, S., & Weltman, A. (2024). Fast Radio Bursts as probes of the late-time universe: a new insight on the Hubble tension. arXiv preprint arXiv:2410.01974v1.
Research Objective: This paper investigates the use of Fast Radio Bursts (FRBs) as a tool to constrain the Hubble constant (H0) and address the ongoing Hubble tension in cosmology.
Methodology: The researchers analyzed a sample of 64 extragalactic, localized FRBs observed by various telescopes. They employed Bayesian analysis with three distinct likelihood functions to calculate H0, accounting for uncertainties in the dispersion measure (DM) components of FRBs, specifically contributions from the Milky Way, its halo, the intergalactic medium (IGM), and the host galaxy of each FRB.
Key Findings: The analysis consistently yielded H0 values above 70 km s−1 Mpc−1, aligning with late-time Universe measurements using supernovae data. Notably, the derived H0 values had significantly reduced error bars (approximately ±2.5 km s−1 Mpc−1) compared to previous FRB studies, making them distinct from early-Universe H0 measurements derived from the Cosmic Microwave Background (CMB).
Main Conclusions: The study demonstrates that FRBs can serve as valuable cosmological probes for measuring H0. The results strengthen the evidence for the Hubble tension, highlighting the discrepancy between early- and late-time Universe measurements of the expansion rate.
Significance: This research contributes to the ongoing debate surrounding the Hubble tension, one of the most pressing issues in cosmology. It showcases the potential of FRBs as a tool to refine our understanding of the Universe's expansion history and potentially motivate new physics beyond the standard cosmological model.
Limitations and Future Research: The study acknowledges the uncertainties associated with measuring DM contributions from the IGM and host galaxies. Future research with larger and more precisely localized FRB samples from upcoming surveys is crucial to further refine H0 measurements and provide more definitive conclusions regarding the Hubble tension. Exploring alternative cosmological models beyond the standard ΛCDM model is also suggested to investigate potential solutions to the tension.
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by Surajit Kali... at arxiv.org 10-04-2024
https://arxiv.org/pdf/2410.01974.pdfDeeper Inquiries