Coherent curvature radiation: maximum luminosity and high-energy emission

High brightness temperature radio transients such as pulsars and fast bursts require the coherent radiation of particles. The antenna class models a large number charged particles radiating in phase, therefore must be spatially confined have well-aligned velocities. Given these necessary conditions, we look at magnetic field induced by currents associated with coherently emitting accelerated consider interaction between field. We find maximum luminosity curvature that depends on source parameters surface neutron star spin period. emission across all luminosities can explained suggest it could universally responsible for both FRBs extreme galactic sources. Using Crab Pulsar an example, constrain origin most nanoshots to within 60km pulsar assuming radiation. In agreement recent observations, also predict simultaneous X-ray from small-scale particle gyration due