{
  "abstract": "Single-file transport means no overtaking: particles move in a narrow channel while preserving their longitudinal order. This simple constraint has profound dynamical consequences, most notably tracer subdiffusion, and has made single-file transport a paradigmatic form of confined many-body motion, observed from molecular transport in zeolites to single-file diffusion of colloids in narrow channels. A common modelling approach assumes that, once overtaking is suppressed, finite-width effects can be discarded or represented by an effective particle size in a strictly one-dimensional model. Starting from the Brownian dynamics in the full confined geometry, we instead derive the exact large-scale one-dimensional fluctuating-hydrodynamic equation governing the coarse-grained line density. Its transport coefficients are fixed by the confined equilibrium equation of state, through which the transverse geometry remains encoded in the one-dimensional description. Consequently, transverse geometry leaves the t 1 / 2 single-file scaling unchanged but can qualitatively reshape the density dependence of the current and tracer fluctuation amplitudes. In the minimal hard-core setting, this yields a collective diffusivity that can become non-monotonic in density for sufficiently wide no-passing channels. This geometric non-monotonicity propagates to exact large-scale predictions for the amplitudes of integrated-current fluctuations and tracer-displacement fluctuations. The effect is robust to the interaction potential, channel geometry, initial preparation and microscopic dynamics. Quasi-one-dimensional single-file transport therefore defines a distinct regime in which forbidding overtaking does not erase geometry from collective transport.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "Journal reference: Rep. Prog. Phys. 89 090501 (2026)",
  "arxiv": "2606.10991",
  "author_total": 2,
  "authors": [
    {
      "name": "Olivier Bénichou"
    },
    {
      "name": "Aurélien Grabsch"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/ecrmvhb9z5dzb.bib",
  "cited_by": 0,
  "doi": "10.1088/1361-6633/ae9afb",
  "fulltext_url": null,
  "id": "ecrmvhb9z5dzb",
  "issns": [
    "0034-4885",
    "1361-6633"
  ],
  "landing_url": "https://hal.science/hal-05752788v1",
  "language": "en",
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "cond-mat.stat-mech"
    ],
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      "hal",
      "0.phys"
    ],
    [
      "hal",
      "1.phys.cond"
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    [
      "hal",
      "2.phys.cond.cm-sm"
    ],
    [
      "openalex",
      "2610|Stochastic processes and statistical mechanics"
    ]
  ],
  "openalex": "W7203705469",
  "pdf_url": "https://hal.science/hal-05752788/document",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-09",
  "publisher": "IOP Publishing",
  "ris": "https://research.draconitic.com/paper/ecrmvhb9z5dzb.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:35Z",
      "native_id": "hal-05752788",
      "source": "hal",
      "url": "https://hal.science/hal-05752788v1"
    },
    {
      "first_seen": "2026-10-30T12:22:19Z",
      "native_id": "2606.10991",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2606.10991"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "hal:1.phys.cond",
      "subfield": "condensed-matter"
    },
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.stat-mech",
      "subfield": "statistical-nonlinear"
    }
  ],
  "title": "Transverse geometry reshapes current and tracer fluctuation amplitudes in quasi-one-dimensional single files",
  "title_text": "Transverse geometry reshapes current and tracer fluctuation amplitudes in quasi-one-dimensional single files",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:22:19Z",
  "url": "https://research.draconitic.com/paper/ecrmvhb9z5dzb",
  "venue": "Reports on Progress in Physics",
  "versions": [
    {
      "doi": "10.1088/1361-6633/ae9afb",
      "pid": "ecrmvhb9z5dzb",
      "relation": "published-as",
      "title": "Transverse geometry reshapes current and tracer fluctuation amplitudes in quasi-one-dimensional single files",
      "venue": "Reports on Progress in Physics"
    }
  ]
}