Relativistic hydrodynamics – causality and stability
KFKI Research Institute for Particle and Nuclear Physics, 1525 Budapest, Hungary
2 BCCS Bergen Computational Physics Laboratory, 5020 Bergen, Norway
Causality and stability in relativistic dissipative hydrodynamics are important conceptual issues. We argue that causality is not restricted to hyperbolic set of differential equations. E.g. heat conduction equation can be causal considering the physical validity of the theory. Furthermore we propose a new concept of relativistic internal energy that clearly separates the dissipative and non-dissipative effects. We prove that with this choice we remove all known instabilities of the linear response approximation of viscous and heat conducting relativistic fluids. In this paper the Eckart choice of the velocity field is applied.
© EDP Sciences, Springer-Verlag, 2008