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Journal Article

On the inertia of heat

MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons49233

Smerlak,  Matteo
Microscopic Quantum Structure & Dynamics of Spacetime, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

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Fulltext (public)

1202.3324
(Preprint), 104KB

EuropPhysJouPlus127_72.pdf
(Any fulltext), 281KB

Supplementary Material (public)
There is no public supplementary material available
Citation

Smerlak, M. (2012). On the inertia of heat. The European Physical Journal Plus, 127(7): 72. doi:10.1140/epjp/i2012-12072-4.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000F-8422-9
Abstract
Does heat have inertia? This question is at the core of a long-standing controversy on Eckart's dissipative relativistic hydrodynamics. Here I show that the troublesome inertial term in Eckart's heat flux arises only if one insists on defining thermal diffusivity as a spacetime constant. I argue that this is the most natural definition, and that all confusion disappears if one considers instead the space-dependent comoving diffusivity, in line with the fact that, in the presence of gravity, space is an inhomogeneous medium.