“…Some models able to explain repeating FRBs, such as FRB 121102 and also the later reported FRB 180814.J0422+73 (CHIME/FRB Collaboration 2019b), are: relativistic beams accelerated by impulsive magnetohydrodynamic driven mechanism, which interact with clouds at the center of star-forming dwarf galaxies (Vieyro et al 2017); soft-gamma repeaters (Wang & Yu 2017); starquakes of a magnetar (Wang et al 2018); mass transfer in a magnetic white dwarf and neutron star (NS) with strong bipolar magnetic field binary systems (Gu et al 2016), highly magnetized pulsars traveling through asteroid belts (Dai et al 2016) and binary NSs not far away from merging (Totani 2013;Wang et al 2016). Several other proposals can be seen, for instance, in Wadiasingh et al (2020), Dai et al (2016), Wadiasingh & Timokhin (2019), Gupta & Saini (2018), Michilli et al (2018), Levin et al (2020), Ioka & Zhang (2020), Kashihama & Murase (2017), a state that is heavily reminiscent of the situation of gamma-ray bursts (GRBs) in the decade before the 1990s (Nemiroff 1994) and suggests that more than one event is actually contributing to the FRB phenomenon. The issue of repeating versus non-repeating sources is actively under discussion.…”