  The composition of the astrophysical relativistic jets remains uncertain. By
kinetic particle-in-cell simulations, we show that the baryon component in the
jet, or the so-called baryon loading effect (BLE), heavily affects relativistic
jets transport dynamics in the interstellar medium. On the one hand, with the
BLE, relativistic jets can transport in a much longer distance, because jet
electrons draw a significant amount of energy from jet baryons via the
Buneman-induced electrostatic waves and the Weibel-mediated collisionless
shock; on the other hand, the jet electron phase space distribution may
transform from a bottom-wide-single-peak structure to a
center-wide-multiple-peak one by increasing the BLE, which largely influences
the observed jet morphology. Implications for related astrophysical studies are
also discussed.
