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Open AccessArticle

Short-Lived Lattice Quasiparticles for Strongly Interacting Fluids

by Miller Mendoza Jimenez 1,*,† and 2,3,†
1
ETH Zürich, Computational Physics for Engineering Materials, Institute for Building Materials,Wolfgang-Pauli-Strasse 27, HIT, CH-8093 Zürich, Switzerland
2
Istituto per le Applicazioni del Calcolo C.N.R., Via dei Taurini 19, 00185 Rome, Italy
3
Institute for Applied Computational Science, Harvard University, Oxford Street, 52, Cambridge, 02138 MA, USA
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Antonio M. Scarfone
Entropy 2015, 17(9), 6169-6178; https://doi.org/10.3390/e17096169
Received: 3 July 2015 / Revised: 19 August 2015 / Accepted: 31 August 2015 / Published: 3 September 2015
(This article belongs to the Special Issue Non-Linear Lattice)
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. View Full-Text
Keywords: strongly coupled fluids; Lattice Boltzmann; quantum fluids strongly coupled fluids; Lattice Boltzmann; quantum fluids
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Jimenez, M.M.; Succi, S. Short-Lived Lattice Quasiparticles for Strongly Interacting Fluids. Entropy 2015, 17, 6169-6178.

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