Constraining Primordial Black Hole Dark Matter with CHIME Fast Radio Bursts
Keren Krochek, Ely D. Kovetz

TL;DR
This paper assesses the potential of CHIME fast radio burst data to constrain primordial black hole dark matter, proposing new detection algorithms, analyzing initial data, and forecasting future constraints with improved observations.
Contribution
It introduces a new method to detect lensed FRBs, incorporates uncertainties in redshift estimation, and provides preliminary bounds on PBH dark matter using CHIME data.
Findings
Preliminary candidate for PBH lensing identified in CHIME data.
Current data limitations hinder definitive constraints.
Future observations could robustly rule out PBHs above 10 solar masses.
Abstract
Strong lensing of Fast Radio Bursts (FBRs) has been proposed as a relatively clean probe of primordial black hole (PBH) dark matter. Recently, the Canadian Hydrogen Intensity Mapping Experiment (CHIME) published a first catalog of 536 FRBs, 62 of which are from repeating sources. In light of this new data, we re-examine the prospects to constrain the abundance of PBHs via FRBs. Extending previous forecasts, we calculate a PBH dark matter bound using the intrinsic burst width and a calibrated flux-ratio threshold per FRB. In addition, we take into account the uncertainty in the relation between the FRB dispersion measure and source redshift. We outline an algorithm to detect lensed FRBs and a method to simulate its performance on real data and set a flux-ratio threshold for each event, which we use to infer realistic forecasts. We then attempt to extract a preliminary bound using the…
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