Diagrammatic Kubo calculation at van Hove singularity yields Re[η(Ω)] ∼ (|Ω|^{3/2} + T^{3/2})/Ω² and dc shear viscosity ∼ T, differing from Boltzmann transport theory.
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Shear Viscosity at the van Hove singularity
Diagrammatic Kubo calculation at van Hove singularity yields Re[η(Ω)] ∼ (|Ω|^{3/2} + T^{3/2})/Ω² and dc shear viscosity ∼ T, differing from Boltzmann transport theory.