Emission Mechanisms of Fast Radio Bursts

Fast radio bursts (FRBs) are recently discovered mysterious single pulses of emission, mostly coming from cosmological distances (∼1 Gpc). Their short duration, ∼1 ms, and large luminosity demonstrate coherent emission. I review the basic physics emission mechanisms proposed for FRBs. In particular, discuss curvature bunches, synchrotron maser, waves by variable currents during magnetic reconnection. Special attention is paid to magnetar flares as most promising sources Non-linear effects outlined that could place bounds on power outgoing radiation.