Fast Afterglows of Fast Radio Bursts

Abstract

The main FRB event may leave behind a clump of relativistic plasma with high ``free energy'' density. As the plasma undergoes collisionless relaxation, it emits coherent electromagnetic waves. These electromagnetic waves may be observable as a fast radio afterglow, with decreasing frequency and intensity. We demonstrate the fast coherent afterglow in a numerical experiment. We tentatively predict the peak afterglow frequency decreasing with time as $\nu \propto t^{-3/2}$.

5 pages, 3 figures

References in corpus (2)

• A repeating fast radio burst source in a globular cluster
• A Bright Fast Radio Burst from FRB 20200120E with Sub-100-Nanosecond Structure