منابع مشابه
Shear viscosity in a gluon gas.
The relation of the shear viscosity coefficient to the recently introduced transport rate is derived within relativistic kinetic theory. We calculate the shear viscosity over entropy ratio eta/s for a gluon gas, which involves elastic gg-->gg perturbative QCD (PQCD) scatterings as well as inelastic gg<-->ggg PQCD bremsstrahlung. For alpha_{s}=0.3 we find eta/s=0.13 and for alpha_{s}=0.6, eta/s=...
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Shear viscosity η is one of transport coefficients in fluid dynamics, which characterizes how viscous the system is in the presence of flow gradient [1]. Since, in general, shear viscosity is inversely proportional to scattering cross-section, strongly interacting systems have smaller viscosity than weakly interacting ones. Recently a universal minimum bound for the ratio of η to entropy densit...
متن کاملAnomalous minimum in the shear viscosity of a Fermi gas.
We measure the static shear viscosity η in a two-component Fermi gas near a broad collisional (Feshbach) resonance, as a function of interaction strength and energy. We find that η has both a quadratic and a linear dependence on the interaction strength 1/(k(FI)a), where a is the s-wave scattering length and k(FI) is the Fermi wave vector for an ideal gas at the trap center. For energies above ...
متن کاملShear Viscosity in a CFL Quark Star
We compute the shear viscosity in the color-flavor locked (CFL) phase of dense quark matter at low temperature T . Then the contributions of mesons, quarks and gluons to the transport coefficients are Boltzmann suppressed. CFL quark matter displays superfluid properties, and transport phenomena in such cold regime are dominated by phonon-phonon scattering. We study phonons within thermal field ...
متن کاملViscosity of a Lattice Gas
The shear viscosity of a lattice gas can be derived in th e Boltzmann approximat ion from a straightfor ward analysis of th e numerical algorithm. Thi s computat ion is presented first in the case of the Friech-Hasslacher-Pome au two-dimensional triangular lattice. It is then generalized to a regular lat t ice of arbitrary dimension, shape, and collision rules with appropriate symmetries . The ...
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ژورنال
عنوان ژورنال: Physical Review Letters
سال: 2008
ISSN: 0031-9007,1079-7114
DOI: 10.1103/physrevlett.100.172301