Constraining the Earth-mass Primordial Black Hole Mergers Model of the Non-repeating FRBs Using the First CHIME/FRB Catalog

• Published in: Research in astronomy and astrophysics 2024-09, Vol.24 (9), p.95006
• Main Authors: Meng, Min, Huang, Qiu-Ju, Deng, Can-Min
• Format: Article
• Language: English
• Subjects: (cosmology:) dark matter; (stars:) gamma-ray burst: general; black hole physics; Black holes; Earth; Electromagnetic radiation; Power law; Radio bursts
• ISSN: 1674-4527; 2397-6209
• DOI: 10.1088/1674-4527/ad6fe7

In this paper, we upgrade the constraints for the Earth-mass primordial black hole mergers model based on the first Canadian Hydrogen Intensity Mapping Experiment (CHIME)/fast radio burst (FRB) catalog. Assuming the null hypothesis that the observed non-repeating FRBs originate from Earth-mass primordial black hole mergers, we find that how the charges were distributed in the primordial black hole population is well described by a double power-law function with typical charge value of q c / 10 − 5 = 1.60 − 0.28 + 0.28 , where the power-law index α 1 = 2.33 − 0.18 + 0.15 for q < q c and α 2 = 4.56 − 0.26 + 0.30 for q ≥ q c . Here, q represents the charge of the black hole in units of G M , where M is the mass of the black hole. Furthermore, we infer the local event rate of the bursts is 8.8 − 2.1 + 5.7 × 10 4 Gpc − 3 yr − 1 , which indicates that an abundance of the primordial black hole population f ≳ 10 −4 is needed to account for the observed FRBs by CHIME. The results of this paper lay the basis for further research on the electromagnetic radiation background generated by the merger of primordial black hole mergers.