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The microphysics of relativistic collisionless sheared flows is investigatedin a configuration consisting of a globally neutral, relativistic $e^-e^+$ beamstreaming through a hollow plasma/dielectric channel. We show throughmultidimensional PIC simulations that this scenario excites the Mushroominstability (MI), a transverse shear instability on the electron-scale, whenthere is no overlap (no contact) between the $e^-e^+$ beam and the walls of thehollow plasma channel. The onset of the MI leads to the conversion of thebeam's kinetic energy into magnetic (and electric) field energy, effectivelyslowing down a globally neutral body in the absence of contact. Thecollisionless shear physics explored in this configuration may operate inastrophysical environments, particularly in highly relativistic and supersonicsettings where macroscopic shear processes are stable.

Slow down of a globally neutral relativistic $e^-e^+$ beam shearing the vacuum