Abstract:
We study time-dependent relativistic jets under the influence of the radiation field of the accretion disk. The
accretion disk consists of an inner compact corona and an outer sub-Keplerian disk. The thermodynamics of the
fluid is governed by a relativistic equation of state (EOS) for multispecies fluid that enables us to study the effect of
composition on jet dynamics. Jets originate from the vicinity of the central black hole, where the effect of gravity is
significant and traverses large distances where only special relativistic treatment is sufficient. So we have modified
the flat metric to include the effect of gravity. In this modified relativistic framework we have developed a new
total variation diminishing routine along with a multispecies EOS for the purpose. We show that the acceleration of
jets crucially depends on flow composition. All the results presented are transonic in nature; starting from very low
injection velocities, the jets can achieve high Lorentz factors. For sub-Eddington luminosities, lepton-dominated
jets can be accelerated to Lorentz factors >50. The change in radiation field due to variation in the accretion disk
dynamics will be propagated to the jet in a finite amount of time. Hence, any change in radiation field due to a
change in disk configuration will affect the lower part of the jet before it affects the outer part. This can drive shock
transition in the jet flow. Depending on the disk oscillation frequency, amplitude, and jet parameters, these shocks
can collide with each other and may trigger shock cascades.
