{
  "abstract": "Cross helicity, the velocity--magnetic-field correlation, is an ideal invariant of incompressible magnetohydrodynamics and constrains energy cascades and magnetic-field generation. Although cross helicity typically decays via visco-resistive effects, we analytically demonstrate that it grows exponentially in sheared inhomogeneous turbulence. This cross-helical shear instability is confirmed using three-dimensional numerical simulations. Growth requires a nonzero gradient of the Reynolds--Maxwell stress to produce turbulent cross helicity; this production overcomes effective losses when shear exceeds a threshold set by the ratio of turbulent magnetic to momentum diffusivities.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.28424",
  "author_total": 6,
  "authors": [
    {
      "name": "B. Tripathi"
    },
    {
      "name": "A. E. Fraser"
    },
    {
      "name": "P. W. Terry"
    },
    {
      "name": "E. G. Zweibel"
    },
    {
      "name": "M. J. Pueschel"
    },
    {
      "name": "A. M. Beloborodov"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/bp3mkz1vcahyz.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.28424",
  "fulltext_url": null,
  "id": "bp3mkz1vcahyz",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.28424",
  "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.SR"
    ],
    [
      "arxiv",
      "physics.flu-dyn"
    ],
    [
      "arxiv",
      "physics.plasm-ph"
    ],
    [
      "arxiv",
      "physics.space-ph"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2610.28424",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-20",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/bp3mkz1vcahyz.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:34:04Z",
      "native_id": "2610.28424",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.28424"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.SR",
      "subfield": "stellar"
    },
    {
      "field": "physics",
      "origin": "arxiv:physics.flu-dyn",
      "subfield": "fluid-dynamics"
    },
    {
      "field": "physics",
      "origin": "arxiv:physics.plasm-ph",
      "subfield": "plasma"
    }
  ],
  "title": "Exponential Growth of Turbulent Cross Helicity in Shear-Flow-Driven Turbulence",
  "title_text": "Exponential Growth of Turbulent Cross Helicity in Shear-Flow-Driven Turbulence",
  "type": "preprint",
  "updated_at": "2026-10-30T12:34:04Z",
  "url": "https://research.draconitic.com/paper/bp3mkz1vcahyz",
  "venue": "arXiv",
  "versions": []
}