Refined Constraints on the Hubble Constant from Localized FRBs with Assessment of Systematic Effects

Abstract

The dispersion measure-redshift relation of fast radio bursts (FRBs) provides a valuable cosmological probe for constraining the Hubble constant, offering an independent measurement that could help resolve the ongoing Hubble tension. In this paper, we begin with a sample of 117 localized FRBs and use 95 of them to constrain $H_0$ to $71.28_{-2.08}^{+1.90}$ km s${}^{-1}$ Mpc${}^{-1}$ within the standard Lambda Cold Dark Matter ($\Lambda$CDM) model. The resulting statistical uncertainty is below 2.8\%, improving previous FRB-based measurements and highlighting the promise of larger future samples. Beyond statistical improvements, we note that different parameter choices have been adopted in previous studies and some results show discrepancies in $H_0$. To address this issue, we perform a systematic assessment of modeling uncertainties that can affect the inferred value of $H_0$, including Galactic electron density models, the contribution of the Galactic halo, outliers such as FRB~20190520B located in extreme environments, and the other parameter selections. We also discuss possible approaches to mitigate these sources of uncertainty, emphasizing both the challenges and prospects of using FRBs as reliable cosmological tools.

17 pages, 6 figures. This is the preprint version corresponding to the published article in ApJ 988, 177 (2025). A cross-listing to astro-ph.CO is kindly requested due to the relevance to cosmological parameter constraints

References in corpus (14)

• A bright millisecond radio burst of extragalactic origin
• A New Electron Density Model for Estimation of Pulsar and FRB Distances
• A census of baryons in the Universe from localized fast radio bursts
• Fast Radio Bursts
• The Physical Mechanisms of Fast Radio Bursts
• A nearby repeating fast radio burst in the direction of M81
• Probing Galactic Halos with Fast Radio Bursts
• LOFAR Detection of 110-188 MHz Emission and Frequency-Dependent Activity from FRB 20180916B
• A Local Universe Host for the Repeating Fast Radio Burst FRB 20181030A
• A Distant Fast Radio Burst Associated to its Host Galaxy with the Very Large Array
• Chronicling the Host Galaxy Properties of the Remarkable Repeating FRB 20201124A
• Intergalactic medium dispersion measures of fast radio bursts estimated from IllustrisTNG simulation and their cosmological applications
• An FRB Sent Me a DM: Constraining the Electron Column of the Milky Way Halo with Fast Radio Burst Dispersion Measures from CHIME/FRB
• Contemporaneous optical-radio observations of a fast radio burst in a close galaxy pair