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| Autores principales: | , |
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| Formato: | Preprint |
| Publicado: |
2025
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| Materias: | |
| Acceso en línea: | https://arxiv.org/abs/2508.06120 |
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| _version_ | 1866912922071990272 |
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| author | Arai, Shori Matsumoto, Yosuke |
| author_facet | Arai, Shori Matsumoto, Yosuke |
| contents | Relativistic shocks are considered efficient accelerators of charged particles and play crucial roles in high-energy astrophysical phenomena, such as gamma-ray bursts and pulsar winds. This study focuses on positron accelerations in magnetized relativistic shocks in electron-positron-ion plasma. Employing one-dimensional ab initio particle-in-cell simulations, we found a preferential positron acceleration through an interaction with the wakefield associated with a precursor wave in the upstream region. Test particle simulations revealed that the selective acceleration occurs for sufficiently large amplitudes of the wakefield. The mechanism can be understood as the relativistic $\boldsymbol{E}\times\boldsymbol{B}$ acceleration formulated in the upstream frame. A theoretical analysis of the positron acceleration in astrophysical contexts is presented, supporting ultra-relativistic shocks in pulsar winds as a primary source for the high-energy positron excess. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_06120 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Preferential Positron Acceleration in Relativistic Magnetized Electron-Positron-Ion Shocks Arai, Shori Matsumoto, Yosuke High Energy Astrophysical Phenomena Relativistic shocks are considered efficient accelerators of charged particles and play crucial roles in high-energy astrophysical phenomena, such as gamma-ray bursts and pulsar winds. This study focuses on positron accelerations in magnetized relativistic shocks in electron-positron-ion plasma. Employing one-dimensional ab initio particle-in-cell simulations, we found a preferential positron acceleration through an interaction with the wakefield associated with a precursor wave in the upstream region. Test particle simulations revealed that the selective acceleration occurs for sufficiently large amplitudes of the wakefield. The mechanism can be understood as the relativistic $\boldsymbol{E}\times\boldsymbol{B}$ acceleration formulated in the upstream frame. A theoretical analysis of the positron acceleration in astrophysical contexts is presented, supporting ultra-relativistic shocks in pulsar winds as a primary source for the high-energy positron excess. |
| title | Preferential Positron Acceleration in Relativistic Magnetized Electron-Positron-Ion Shocks |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2508.06120 |