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- W4298051128 abstract "We study the linear stability of a planar interface separating two fluids in relative motion, focusing on conditions appropriate for the boundaries of relativistic jets. The jet is magnetically dominated, whereas the ambient wind is gas-pressure dominated. We derive the most general form of the dispersion relation and provide an analytical approximation of its solution for an ambient sound speed much smaller than the jet Alfv'en speed $v_A$, as appropriate for realistic systems. The stability properties are chiefly determined by the angle $psi$ between the wavevector and the jet magnetic field. For $psi=pi/2$, magnetic tension plays no role, and our solution resembles the one of a gas-pressure dominated jet. Here, only sub-Alfv'enic jets are unstable ($0<M_eequiv(v/v_A)costheta<1$, where $v$ is the shear velocity and $theta$ the angle between the velocity and the wavevector). For $psi=0$, the free energy in the velocity shear needs to overcome the magnetic tension, and only super-Alfv'enic jets are unstable ($1<M_e<sqrt{(1+Gamma_w^2)/[1+(v_A/c)^2Gamma_w^2]}$, with $Gamma_w$ the wind adiabatic index). Our results have important implications for the propagation and emission of relativistic magnetized jets." @default.
- W4298051128 created "2022-10-01" @default.
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- W4298051128 date "2022-09-27" @default.
- W4298051128 modified "2023-09-23" @default.
- W4298051128 title "The Kelvin-Helmholtz instability at the boundary of relativistic magnetized jets" @default.
- W4298051128 doi "https://doi.org/10.48550/arxiv.2209.13699" @default.
- W4298051128 hasPublicationYear "2022" @default.
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