Cosmic rays enhance momentum transfer in Kelvin-Helmholtz turbulent shear flows by acting as long-range messengers when their gyroradii are smaller than the shear scale, increasing effective viscosity even when not energetically dominant.
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A toy model of reverse shocks in novae predicts GeV gamma rays near optical peak and potential TeV emission later, consistent with Fermi observations under an empirically thin post-shock layer.
Coherent structures that self-consistently emerge in strong MHD turbulence serve as the dominant sites for localized electric-field intensification and repeated particle acceleration across cosmic plasmas.