Coherent inverse Compton scattering in Fast Radio Bursts

Fast Radio Bursts (FRBs) are the milliseconds-duration radio bursts mainly originating from cosmological distances. Observations show that FRBs are highly polarized and some FRBs have narrow frequency spectrum. Both polarization properties and narrow bandwidth carry important information about radiation mechanisms and environment properties of FRB sources. In this talk, I will discuss two main questions regarding the physical mechanisms of FRBs by using observational results. The topics include “Can strong FRB waves escape from the magnetosphere?” and “How are FRBs produced through possible coherent radiation mechanisms?”. I will provide arguments that FRBs likely originated from the magnetar magnetosphere, and discuss the production and propagation of FRBs. I will comment on the pros and cons of close-in (Pulsar-like) and far-away (GRB-like) radiation models based on the observational bandwidth data. I will propose that the low frequency waves (fast magnetosonic mode) can be boosted to power FRBs via inverse Compton scattering (ICS) and discuss the observational implications, the differences between ICS and curvature radiation models will also be discussed.