Living Reviews in RelativityCurrent articles from Living Reviews in Relativity. Living Reviews in Relativity is a peer-refereed, solely online physics journal publishing invited reviews covering all areas of relativity research. Reviews are kept up to date by their authors. All reference information is collected into a searchable database. Living Reviews in Relativity is a free resource to the scientific community. Published by the Max Planck Institute for Gravitational Physics (Albert Einstein Institute), Potsdam,...Speeds of Propagation in Classical and Relativistic Extended Thermodynamics- June 14, 1999 The Navier-Stokes-Fourier theory of viscous, heat-conducting fluids provides parabolic equations and thus predicts infinite pulse speeds. Naturally this feature has disqualified the theory for relativistic thermodynamics which must insist on finite speeds and, moreover, on speeds smaller than $c$. The attempts at a remedy have proved heuristically important for a new systematic type of thermodynamics: Extended thermodynamics. That new theory has symmetric hyperbolic field equations and thus it..http://www.livingreviews.org/lrr-1999-1 |