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| Main Authors: | , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2503.10888 |
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| _version_ | 1866929759655559168 |
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| author | Lloyd-Ronning, Nicole M. Kilian, Patrick Chen, Guangye Huang, Chengkun Guo, Fan Sahd, Lucian Silva, Makana |
| author_facet | Lloyd-Ronning, Nicole M. Kilian, Patrick Chen, Guangye Huang, Chengkun Guo, Fan Sahd, Lucian Silva, Makana |
| contents | We present particle-in-cell simulations of one dimensional relativistic electromagnetic shocks in a uniform magnetic field, for a range of magnetic field strengths, plasma temperatures and numerical initial conditions. We show that the particle energy distributions of these shocks can develop a state of population inversion in the precursor and shock regions, which may allow for synchrotron maser (or maser-like, coherent) emission. Our set-up is applicable to conditions expected in models of fast radio bursts and therefore lends credence to the synchrotron maser model for these transients. We also show, for the first time, how a newly developed ``analytic particle pusher'' for kinetic simulations gives similar results to the commonly-used Boris pusher, but for larger timesteps and without the need to resolve the gyro-radius and gyro-period of the system. This has important implications for modeling astrophysical plasmas in extreme magnetic fields as well as for bridging scales between kinetic and fluid regimes. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_10888 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Novel Methods for Simulating Astrophysical Plasmas and the Coherent Emission in Fast Radio Bursts Lloyd-Ronning, Nicole M. Kilian, Patrick Chen, Guangye Huang, Chengkun Guo, Fan Sahd, Lucian Silva, Makana High Energy Astrophysical Phenomena We present particle-in-cell simulations of one dimensional relativistic electromagnetic shocks in a uniform magnetic field, for a range of magnetic field strengths, plasma temperatures and numerical initial conditions. We show that the particle energy distributions of these shocks can develop a state of population inversion in the precursor and shock regions, which may allow for synchrotron maser (or maser-like, coherent) emission. Our set-up is applicable to conditions expected in models of fast radio bursts and therefore lends credence to the synchrotron maser model for these transients. We also show, for the first time, how a newly developed ``analytic particle pusher'' for kinetic simulations gives similar results to the commonly-used Boris pusher, but for larger timesteps and without the need to resolve the gyro-radius and gyro-period of the system. This has important implications for modeling astrophysical plasmas in extreme magnetic fields as well as for bridging scales between kinetic and fluid regimes. |
| title | Novel Methods for Simulating Astrophysical Plasmas and the Coherent Emission in Fast Radio Bursts |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2503.10888 |