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- W2895367095 abstract "A fast spectral method (FSM) is developed to solve the Uehling-Uhlenbeck equation for quantum gas mixtures with generalized differential cross-sections. Spatially-homogeneous relaxation problems are used to demonstrate that the FSM conserves mass and momentum/energy to the machine and spectral accuracy, respectively. Based on the variational principle, transport coefficients such as the shear viscosity, thermal conductivity, and diffusion are calculated by the FSM, which compare well with analytical solutions. Then, we apply the FSM to find the accurate transport coefficients through an iterative scheme for the linearized quantum Boltzmann equation. The shear viscosity and thermal conductivity of the three-dimensional quantum Fermi and Bose gases interacting through hard-sphere potential are calculated. For Fermi gas, the relative difference between the accurate and variational transport coefficients increases with the fugacity; for Bose gas, the relative difference in the thermal conductivity has similar behavior as the gas moves from the classical to the degenerate limits, but that in the shear viscosity decreases. Finally, the shear viscosity and diffusion coefficient have also been calculated for a two-dimensional equal-mole mixture of Fermi gases. When the molecular mass of the two components are the same, our numerical results agree well with the variational solution. However, when the molecular mass ratio is not one, large discrepancies between the accurate and variational results are observed; our results are reliable because (i) the method relies on no assumption and (ii) the ratio between shear viscosity and entropy density satisfies the minimum bound predicted by the string theory." @default.
- W2895367095 created "2018-10-12" @default.
- W2895367095 creator A5040952837 @default.
- W2895367095 date "2018-10-07" @default.
- W2895367095 modified "2023-09-27" @default.
- W2895367095 title "A fast spectral method for the Uehling-Uhlenbeck equation for quantum gas mixtures: homogeneous relaxation and transport coefficients" @default.
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- W2895367095 doi "https://doi.org/10.48550/arxiv.1810.03090" @default.
- W2895367095 hasPublicationYear "2018" @default.
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