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Unraveling the Landau's consistence criterion and the meaning of interpenetration in the "Two-Fluid" Model

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arxiv 1806.11034 v2 pith:EUTFW22Z submitted 2018-06-28 physics.flu-dyn cond-mat.other

Unraveling the Landau's consistence criterion and the meaning of interpenetration in the "Two-Fluid" Model

classification physics.flu-dyn cond-mat.other
keywords criterioninterpenetrationlandaumeaningconsistencemodeltimetwo-fluid
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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