arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2510.08037astro-ph.HE
收藏

快速射电暴驱动的超高能粒子加速

Acceleration of Ultrahigh Energy Particles from Fast Radio Bursts

Shanghai Jiao Tong University(上海交通大学);Tsung-Dao Lee Institute, Shanghai Jiao Tong University(上海交大李政道研究所)

Lin Yu, Tianxing Hu, Zhiyu Lei, Xiangyan An, Dong Wu, Suming Weng, Min Chen, Jie Zhang, Zhengming Sheng

AI总结:

研究快速射电暴(FRB)在电子-正电子-离子等离子体系统中驱动的粒子加速,发现通过脉冲前沿侵蚀形成超高能中性等离子体片,并识别出两种离子加速机制(活塞机制和尾场机制),其能量标度与粒子模拟一致,且产生的幂律能谱与宇宙线相符。

摘要:

宇宙中的两种极端事件——快速射电暴(FRB)和宇宙线(CR)——可能存在关联,FRB在其源附近具有极端场强,可能对宇宙线有贡献。本研究探讨了在电子-正电子-离子等离子体系统中,由类似FRB的超相对论电磁脉冲驱动的局域粒子加速。研究发现,通过FRB脉冲的前沿侵蚀,会持续形成超高能中性等离子体片。根据场强和等离子体密度,存在两种离子加速机制:由脉冲洛伦兹力驱动的活塞机制,以及由电荷分离场主导的尾场机制。预测的能量标度与粒子模拟结果吻合良好。在FRB向外膨胀过程中,自然产生幂律能谱,其指数接近宇宙线能谱。探测可能由FRB产生的高能粒子,有助于更深入地理解其起源,并推动多信使天文学的发展。

英文摘要:

Two extreme events in the universe, fast radio bursts (FRBs) and cosmic rays (CRs), could be correlated, where FRBs with extreme field strength near their sources may contribute to CRs. This study investigates localized particle acceleration driven by FRB-like ultra-relativistic electromagnetic pulses in an electron--positron--ion plasma system. It is found ultra-high energy neutral plasma sheets form constantly via the front erosion of an FRB pulse. There are two regimes of ion acceleration depending upon the field strength and the plasma density: the piston regime driven by the Lorentz force of the pulse, and the wakefield regime dominated by charge separation field. The predicted energy scalings align well with particle-in-cell simulations. A power-law energy spectrum with an index close to the CRs naturally emerges during FRBs expansion outward. Detecting high-energy particles possibly produced by FRBs enables deeper insights into their origins and promotes the development of multi-messenger astronomy.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑