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Radiation Reaction Effects on Coherent Emission in Relativistic Magnetized Shocks
Yu Zhang1, Yuan-Pei Yang2, Liang-Liang Ji1
1Shanghai Institute of Optics and Fine Mechanics, State Key Laboratory of Ultra-intense Laser Science and Technology, Chinese Academy of Sciences, Shanghai 201800, People's Republic of China.
Physical Review Letters
|August 10, 2026
Summary
Radiation reaction (RR) in relativistic magnetized shocks boosts coherent radiation intensity and energy efficiency by enabling multiple electron gyration cycles. This finding offers new insights into fast radio bursts (FRBs) phenomena.
Area of Science:
- Astrophysics
- Plasma Physics
Background:
- Relativistic magnetized shocks are key sources of coherent radiation.
- Fast Radio Bursts (FRBs) are a potential application for understanding these phenomena.
Purpose of the Study:
- To investigate the impact of radiation reaction (RR) on particle dynamics and coherent radiation in relativistic magnetized shocks.
- To explore the implications of RR for Fast Radio Bursts (FRBs).
Main Methods:
- Utilized kinetic particle simulations to model shock acceleration and radiation processes.
- Analyzed particle dynamics and radiation properties under the influence of RR.
Main Results:
- Radiation reaction significantly suppresses electron energies, leading to multiple coherent gyration cycles.
- RR amplifies coherent radiation intensity and energy efficiency compared to standard models.
- Observed spectral changes include upshifted peak frequency, broadened bandwidth, and narrow spectral peaks.
Conclusions:
- RR-mediated shocks offer a plausible explanation for observed FRB characteristics like luminosity-bandwidth correlation and narrow spectra.
- The findings provide a novel framework for understanding the generation mechanisms of FRBs.
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