2 research outputs found
Causality and classical dispersion relations
We explore the consequences of relativistic causality and covariant stability
for short-wavelength dispersion relations in classical systems. For excitations
described by a finite number of partial differential equations, as is the case
in relativistic hydrodynamics, we give causality and covariant stability
constraints on the excitation's frequency at large momenta.Comment: 16 pages, 1 figure. v2: reference added, small clarification