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# Constraints on compact dark matter with fast radio burst observations

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### Abstract

Fast Radio Bursts (FRBs) are bright radio transients with millisecond duration at cosmological distances. Since compact dark matter (CDM) could act as lenses and cause split of this kind of very short duration signals, Mu$$\rm{\tilde{n}}$$oz et al. (2016) has proposed a novel method to probe CDM with lensing of FRBs. In this Letter, we for the first time apply this method to real data and give constraints of the nature of CDM with currently available FRB observations. We emphasize the information from dynamic spectra of FRBs is quite necessary for identifying any lensed signals and find no echoes in the existing data. The null search gives a constraint comparable to that from galactic wide binaries, though the methods of redshift inference from dispersion measure would impact a little. Furthermore, we make an improved forecast basing on the distributions of real data for the CHIME-like experiments. Finally, we discuss the situation where one or more lensed signals will be detected. In such a case, the CDM parameter space can be pinned down very well since the lens mass can be directly determined through the observed flux ratio and time delay between split images.

### Author and article information

###### Journal
30 March 2020
###### Article
2003.13349