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PreprintarXiv licencearXiv

Collisionless dynamo seeds from phase mixing-induced electron slippage

  • István Pusztai
  • Lise Hanebring
  • James Juno
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Abstract

Magnetic fields permeating the Universe on the largest astrophysical scales are thought to result from dynamo amplification in weakly collisional turbulence, but the origin of the seed fields remains an open problem of cosmic magnetogenesis. We identify a kinetic mechanism for magnetic-field generation in initially unmagnetized, collisionless plasmas, arising from phase-mixing-induced braking of spatially varying electron flows. Using analytical theory, fully kinetic Vlasov simulations, and turbulent scaling arguments, we show that this process generates coherent magnetic seed fields on scales far larger than the characteristic kinetic scales of the plasma, with strengths comparable to or exceeding classical Biermann battery estimates. The mechanism requires neither a finite initial magnetic field nor misaligned thermodynamic gradients and occurs naturally in electron-ion plasmas.

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Cite

BibTeXRIS
BibTeX
@misc{pusztai2026collisionless,
  title = {{Collisionless dynamo seeds from phase mixing-induced electron slippage}},
  author = {István Pusztai and Lise Hanebring and James Juno},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2606.27833},
  eprint = {2606.27833},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2606.27833},
}
RIS
TY  - UNPB
TI  - Collisionless dynamo seeds from phase mixing-induced electron slippage
AU  - István Pusztai
AU  - Lise Hanebring
AU  - James Juno
PY  - 2026
DA  - 2026/10/27
PB  - arXiv
DO  - 10.48550/arxiv.2606.27833
UR  - https://arxiv.org/abs/2606.27833
AB  - Magnetic fields permeating the Universe on the largest astrophysical scales are thought to result from dynamo amplification in weakly collisional turbulence, but the origin of the seed fields remains an open problem of cosmic magnetogenesis. We identify a kinetic mechanism for magnetic-field generation in initially unmagnetized, collisionless plasmas, arising from phase-mixing-induced braking of spatially varying electron flows. Using analytical theory, fully kinetic Vlasov simulations, and turbulent scaling arguments, we show that this process generates coherent magnetic seed fields on scales far larger than the characteristic kinetic scales of the plasma, with strengths comparable to or exceeding classical Biermann battery estimates. The mechanism requires neither a finite initial magnetic field nor misaligned thermodynamic gradients and occurs naturally in electron-ion plasmas.
ER  -