Nonconformal kinetic theory and hydrodynamics for Bjorken flow

Using and comparing kinetic theory second-order Chapman-Enskog hydrodynamics, we study the non-conformal dynamics of a system undergoing Bjorken expansion. We use concept `free-streaming fixed lines' for scaled shear bulk stresses in show that these `fixed behave as early-time attractors repellors evolution. In conformal limit, free-streaming lines reduce to well-known points dynamics. A new point free streaming regime is identified which lies at intersection lines. Contrary scenario, both hydrodynamics predict absence attractor behavior normalised stress channel. far-off-equilibrium found effective longitudinal pressure, driven by rapid Second-order viscous fails accurately describe this attractor. From thorough analysis conclude failure results from an inaccurate approximation related incorrect description nature point. modified anisotropic hydrodynamic presented provides excellent agreement with reproduces far-from-equilibrium pressure.