Coherent inverse Compton scattering by bunches in fast radio bursts

Understand

The extremely high brightness temperature of fast radio bursts (FRBs) requires that their emission mechanism must be "coherent", either through concerted particle emission by bunches or through an exponential growth of a plasma wave mode or radiation amplitude via certain maser mechanisms.

• The bunching mechanism has been mostly discussed within the context of curvature radiation or cyclotron/synchrotron radiation.
• Here we propose a family of model invoking coherent inverse Compton scattering (ICS) of bunched particles that may operate within or just outside of the magnetosphere of a flaring magnetar.
• Crustal oscillations during the flaring event may excite low-frequency electromagnetic waves near the magnetar surface.