Fate of the Mach cone in covariant transport theory

There has been a lot of recent theoretical interest in conical flow in heavy-ion collisions[1, 2, 3, 4]. Important open questions are how the collision dynamics (rapid expansion, phase transition, inhomogeneities) and dissipation (viscosity) affect this unique flow pattern. It would be natural to investigate these questions using causal dissipative hydrodynamics, however, the 3+1D codes required still have to be developed. Here I employ a convenient alternative[5], covariant transport theory, which is fully causal and stable, can address full 3+1D, and has a well-defined hydrodynamic limit.