Interface instabilities in hydrodynamic relativistic jets

Both the dynamics and observational properties of relativistic jets are determined by their interaction with ambient medium. A crucial role is played contact discontinuity at jet boundary, which in presence collimation may become subject to Rayleigh-Taylor instability (RTI) Richtmyer-Meshkov (RMI). Here, we study evolution these instabilities non-magnetized using special three-dimensional hydrodynamic simulations. We show that growth initial perturbations consistent RTI operating region. The contribution RMI becomes important downstream from shock agreement theoretical expectations. reach non-linear scales above convergence point trigger strong turbulence, mixing matter. devise an analytic solution for rate it sensitive external density gradients. Our results be applied different types astrophysical objects. In particular, interface a natural explanation observed dichotomy between FR-I FR-II radiogalaxies. rapid slow-down M87 baryon entrainment circumnuclear matter distribution. microquasars, loading triggered probable reason low Lorentz factors. variability gamma-ray bursts cannot come driven likely originates engine, suggesting magnetic fields jet.