@article{article,
  author = {B. Tripathi and A. E. Fraser and P. Mantica and P. W. Terry and E. G. Zweibel and M. J. Pueschel and A. M. Beloborodov},
  title = {Exponential Growth of Turbulent Cross Helicity in Shear-Flow-Driven Turbulence},
  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.},
  year = {2026},
  journal = {Physical Review E},
  volume = {114},
  pages = {in press},
  publisher = {American Physical Society},
  url = {https://arxiv.org/abs/2610.28424},
  doi = {10.1103/7cpx-3z6h},
  language = {eng},
}