• Accepted Paper

New measurement of the FRB DM-galaxy cross correlation and a first joint analysis with the kinematic Sunyaev-Zel’dovich effect

Samuel McCarty, Liam Connor, Vishnu Balakrishnan, Pranav Sanghavi, Kritti Sharma, Kaitlyn Shin, Simone Ferraro, Vikram Ravi, Casey Law, Elisabeth Krause, and Boryana Hadzhiyska

Phys. Rev. D - Accepted 14 October, 2026

DOI: https://doi.org/10.1103/9cln-b8mn

Abstract

Understanding the distribution of cosmic baryons is crucial for advancing cosmology and galaxy formation. Localized Fast Radio Bursts (FRBs) are a promising new probe of the diffuse gas, but measurements thus far have been limited by small sample size. In this work, we measure the FRB dispersion measure (DM)-galaxy cross correlation with 130 localized FRBs, including new spectroscopic host redshifts from the DSA-110, and the DESI Legacy Survey Bright Galaxy Sample. We detect this signal at the highest significance to date (6.5σ) in both configuration and harmonic space. By comparing to simulations and a halo model, we demonstrate that this statistic can constrain the strength of baryonic feedback. Our measurements disfavor a no-feedback scenario in which gas traces the underlying dark matter at ∼,9σ. In addition to small scale feedback, this represents one of the first direct measurements of the clustering of electrons on scales larger than a few Mpc. We compare our measurement to recent kinematic Sunyaev-Zeldovich effect (kSZ) studies, which show good agreement despite the differences in observational methods and sample selection. Finally, we make a first attempt at breaking the kSZ optical depth degeneracy with FRBs, jointly measuring the growth rate of large-scale structure fσ8. With future samples, FRB two-point statistics will provide precision constraints on the distribution of cosmic baryons and complement other probes.

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