{
  "abstract": "During relativistic magnetic reconnection, X-points ($E>B$ regions at vanishing guide field) have been proposed to play an essential role in injecting particles into the nonthermal population. Using fully kinetic particle-in-cell simulations at a range of magnetizations $σ\\equiv B_0^2/(4πn_0 m_e c^2) = 12$--$800$, we study in detail how the particle energy gains up to the injection threshold $γ_{\\rm inj} = σ/4$ are partitioned into work done inside $E>B$ regions (unmagnetized), within one gyration after exit (re-magnetizing), and at all other times (magnetized). The magnetized channel supplies the largest part of the energy gain for $\\sim 95\\%$ of injected tracers at $σ= 12$ and $\\sim 65\\%$ at $σ= 800$. Most of the tracers in this magnetized majority never enter an $E>B$ region before injection. We also compare these injection shares with the earlier studies that proposed an essential role for $E>B$ regions. We conclude that $E>B$ regions are neither necessary for injection nor the dominant direct contributors to pre-injection work by injection share in two-dimensional, nonradiative pair-plasma reconnection at vanishing guide field.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.22118",
  "author_total": 7,
  "authors": [
    {
      "name": "Omar French"
    },
    {
      "name": "Fan Guo"
    },
    {
      "name": "Xiaocan Li"
    },
    {
      "name": "Qile Zhang"
    },
    {
      "name": "Yi-Hsin Liu"
    },
    {
      "name": "William Daughton"
    },
    {
      "name": "Hui Li"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/em7tbm202atbt.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.22118",
  "fulltext_url": null,
  "id": "em7tbm202atbt",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.22118",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.HE"
    ],
    [
      "arxiv",
      "physics.plasm-ph"
    ],
    [
      "openalex",
      "3103|Solar and Space Plasma Dynamics"
    ]
  ],
  "openalex": "W7222474065",
  "pdf_url": "https://arxiv.org/pdf/2610.22118",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-15",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/em7tbm202atbt.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:29:50Z",
      "native_id": "2610.22118",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.22118"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.HE",
      "subfield": "high-energy-astrophysics"
    },
    {
      "field": "physics",
      "origin": "arxiv:physics.plasm-ph",
      "subfield": "plasma"
    }
  ],
  "title": "Are $E>B$ regions essential for particle injection in relativistic magnetic reconnection?",
  "title_text": "Are E>B regions essential for particle injection in relativistic magnetic reconnection?",
  "type": "preprint",
  "updated_at": "2026-10-30T12:29:50Z",
  "url": "https://research.draconitic.com/paper/em7tbm202atbt",
  "venue": "arXiv",
  "versions": []
}