http://arxiv.org/abs/2112.10964
Fast radio bursts (FRBs) are coherent powerful radio transients with cosmological origins. The detected galactic FRB reveals that magnetars can generate FRBs, however the mechanism still remains enigmatic. Characteristics of FRBs are limited to observable quantities such as luminosity, duration, spectrum and repetition etc. Due to the uncertainties of triggering mechanisms and source sites within or out of magnetospheres of neutron stars, status of FRBs close to their sources are unknown. As an extreme astronomical event, FRBs could accompany with energy-comparable or even more powerful x/-ray counterparts. Here, we study the interaction of ultrastrong radio pulses in GHz and high-energy photons in GeV. Particle-in-cell simulations show that at the field-strength of about 310^12V/cm, quantum cascade effects can generate dense pair plasmas and the radio pulses are significantly depleted. Therefore, GHz radio pulses of stronger than 310^12V/cm is difficult to escape from emitters if accompanying with GeV photons. This process could afford a limit to the FRB field strength nearby sources. Investigation on the toleration of >10^12V/cm radio waves for potential plasma/beam emitters in neutron-star scenerios should be helpful to distinguish the precise mechanism of FRBs.
Y. Zhang and H. Wu
Wed, 22 Dec 21
41/67
Comments: N/A