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PreprintCC BY 4.0arXiv

Moment-based formulas for the transport coefficients

  • J. -F. Wang
  • G. Qin
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Abstract

The coefficients of the transport equations, describing the propagation features, are particularly important in astrophysics, interplanetary physics, and experimental plasma physics. In this paper, the variable-dependent diffusion coefficients are investigated. For the momentum transport equations, we find that the coefficients are related to statistical quantities, some of which are new. In addition, these coefficients take logarithmic forms, which are different from the results derived in previous papers. For isotropic pitch-angle scattering, we also obtain a formula that takes a logarithmic form. For fractional transport equations, the coefficients expressed in terms of the moments are obtained from the governing equations.

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Cite

BibTeXRIS
BibTeX
@misc{wang2026momentbased,
  title = {{Moment-based formulas for the transport coefficients}},
  author = {J. -F. Wang and G. Qin},
  howpublished = {arXiv},
  year = {2026},
  month = aug,
  doi = {10.48550/arxiv.2608.30116},
  eprint = {2608.30116},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2608.30116},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Moment-based formulas for the transport coefficients
AU  - J. -F. Wang
AU  - G. Qin
PY  - 2026
DA  - 2026/08/31
PB  - arXiv
DO  - 10.48550/arxiv.2608.30116
UR  - https://arxiv.org/abs/2608.30116
AB  - The coefficients of the transport equations, describing the propagation features, are particularly important in astrophysics, interplanetary physics, and experimental plasma physics. In this paper, the variable-dependent diffusion coefficients are investigated. For the momentum transport equations, we find that the coefficients are related to statistical quantities, some of which are new. In addition, these coefficients take logarithmic forms, which are different from the results derived in previous papers. For isotropic pitch-angle scattering, we also obtain a formula that takes a logarithmic form. For fractional transport equations, the coefficients expressed in terms of the moments are obtained from the governing equations.
ER  -