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 structured jet model with weak-scattering thermal heating in the mixed cocoon region reproduces the quasi-thermal and non-thermal spectra of GRB 090902B while broader spectra appear in strong-scattering cases.
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Hybrid Simulations of Supersonic Shear Flows: II) Cosmic Ray Viscosity
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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Shear Particle Acceleration in Structured Gamma-Ray Burst Jets: IV. Thermal {\em vs.} Non-thermal Emission of the Jet Cocoon
A structured jet model with weak-scattering thermal heating in the mixed cocoon region reproduces the quasi-thermal and non-thermal spectra of GRB 090902B while broader spectra appear in strong-scattering cases.