  We study the effect of plasma composition on the dynamics and morphology of
the relativistic astrophysical jets. Our work is based on a relativistic total
variation diminishing (TVD) simulation code. We use a relativistic equation of
state in the simulation code which accounts for the thermodynamics of a
multispecies plasma which is a mixture of electrons, positrons, and protons. To
study the effect of plasma composition we consider various jet models. These
models are characterized by the same injection parameters, same jet kinetic
luminosity, and the same Mach numbers. The evolution of these models shows that
the plasma composition affects the jet head propagation speed, the structure of
the jet head, and the morphology despite fixing the initial parameters. We
conclude that the electron-positron jets are the slowest and show more
pronounced turbulent structures in comparison to other plasma compositions. The
area and locations of the hot-spots also depend on the composition of jet
plasma. Our results also show that boosting mechanisms are also an important
aspect of multi-dimensional simulations which are also influenced by the change
in composition.
