https://doi.org/10.1140/epjb/e2018-90105-x
Regular Article
Unraveling the Landau’s consistence criterion and the meaning of interpenetration in the “Two-Fluid” Model
1
Departamento de Física Teórica, Universidad de Zaragoza,
50009
Zaragoza, Spain
2
Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), Universidad de Zaragoza,
50018
Zaragoza, Spain
3
Unidad asociada IQFR-BIFI,
50018
Zaragoza, Spain
a e-mail: ares@unizar.es
Received:
28
February
2018
Published online: 3
October
2018
In this letter, we show that it is possible to unravel both the physical origin of the Landau’s consistence criterion and the specific and subtle meaning of interpenetration of the “two fluids” if one takes into account that in the hydrodynamic regime one needs a coarse-graining in time to bring the system into local equilibrium. That is, the fuzziness in time is relevant for the phenomenological Landau’s consistency criterion and the meaning of interpenetration. Note also that we are not questioning the validity of the “Two-Fluid” Model.
Key words: Solid State and Materials
© EDP Sciences / Società Italiana di Fisica / Springer-Verlag GmbH Germany, part of Springer Nature, 2018