{
  "abstract": "Charge deposition in the particle-in-cell (PIC) method can be viewed as kernel density estimation on a spatial mesh. This allows the smoothing bandwidth to be selected through statistical criteria such as mean integrated squared error or cross-validation, but it also changes the electric field acting on the particles. Therefore, a selected bandwidth can alter the growth or damping of physical modes. We develop a dynamics-aware bandwidth-selection procedure that combines a density-error objective with constraints on specified linear modes. These constraints follow from the plasma equilibrium and the combined transfer of deposition, filtering and field gathering within the model rate-tolerance boundary. We demonstrate the need for equilibrium information through a controlled two-stream experiment. The controlled two-stream scan varies the beam drift while holding the initial spatial density, thermal samples, wavevector and fixed-filter transfer unchanged. Across four resolved equilibria approaching marginal stability, this filter reduces the measured growth rate by $0.7\\%$ to $9.1\\%$. Equilibrium-dependent interior settings satisfy the prescribed $10\\%$ rate tolerance. We then apply the constrained selection rule to 85 Gaussian candidates, that reduces density and grid-field mean-square errors by $7.40\\%$ and $3.70\\%$ on independently evaluated snapshots. A separate projected-linear calculation at that exact width gives a ratio of mean individual growth rates of $0.9556$, with paired $95\\%$ interval $[0.9453,0.9640]$, consistent with the prediction $0.9513$. Analysis of finite-marker loading and ensemble averaging explains how the measured rates relate to the response model. Together, these results demonstrate a filter-design procedure that combines statistical error reduction with subsequent validation of the selected linear dynamics.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.03230",
  "author_total": 4,
  "authors": [
    {
      "name": "Ayushi Agrawal"
    },
    {
      "name": "Shan-Chang Lin"
    },
    {
      "name": "Ezhilmathi Krishnasamy"
    },
    {
      "name": "Pascal Bouvry"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/9kmwy4cq356dw.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.03230",
  "fulltext_url": null,
  "id": "9kmwy4cq356dw",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.03230",
  "language": null,
  "licence": "CC-BY-SA-4.0",
  "licence_label": "CC BY-SA 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by-sa/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "physics.comp-ph"
    ],
    [
      "arxiv",
      "physics.plasm-ph"
    ],
    [
      "openalex",
      "3107|Dust and Plasma Wave Phenomena"
    ]
  ],
  "openalex": "W7220402343",
  "pdf_url": "https://arxiv.org/pdf/2610.03230",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-27",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/9kmwy4cq356dw.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:35:50Z",
      "native_id": "2610.03230",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.03230"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.comp-ph",
      "subfield": "computational"
    },
    {
      "field": "physics",
      "origin": "arxiv:physics.plasm-ph",
      "subfield": "plasma"
    }
  ],
  "title": "Dynamics-aware bandwidth selection for smoothed charge deposition in 2D electrostatic particle-in-cell",
  "title_text": "Dynamics-aware bandwidth selection for smoothed charge deposition in 2D electrostatic particle-in-cell",
  "type": "preprint",
  "updated_at": "2026-10-30T12:35:50Z",
  "url": "https://research.draconitic.com/paper/9kmwy4cq356dw",
  "venue": "arXiv",
  "versions": []
}