Short-Lived Lattice Quasiparticles for Strongly Interacting Fluids
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Date
2015-09
Publication Type
Journal Article
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yes
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Abstract
It is shown that lattice kinetic theory based on short-lived quasiparticles proves very effective in simulating the complex dynamics of strongly interacting fluids (SIF). In particular, it is pointed out that the shear viscosity of lattice fluids is the sum of two contributions, one due to the usual interactions between particles (collision viscosity) and the other due to the interaction with the discrete lattice (propagation viscosity). Since the latter is negative, the sum may turn out to be orders of magnitude smaller than each of the two contributions separately, thus providing a mechanism to access SIF regimes at ordinary values of the collisional viscosity. This concept, as applied to quantum superfluids in one-dimensional optical lattices, is shown to reproduce shear viscosities consistent with the AdS-CFT holographic bound on the viscosity/entropy ratio. This shows that lattice kinetic theory continues to hold for strongly coupled hydrodynamic regimes where continuum kinetic theory may no longer be applicable.
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published
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Journal / series
Volume
17 (9)
Pages / Article No.
6169 - 6178
Publisher
MDPI
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Software
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Subject
Lattice Boltzmann; Quantum fluids; Strongly coupled fluids
Organisational unit
03733 - Herrmann, Hans Jürgen (emeritus) / Herrmann, Hans Jürgen (emeritus)
02606 - Institut für Baustoffe (IfB) / Institute for Building Materials