In the thermal Frenkel-Kontorova chain, shear thinning and viscosity are set by energy drops at mechanical instabilities, not by thermally activated barrier crossing, so Eyring fits can be coincidental.
9 shows results for the effective viscosity of the k = 10 V0/a2, N = 16, and a/b = 15/16 chain
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Finite-temperature properties of the Frenkel-Kontorova model: Relation to tribological systems and fluid rheology
In the thermal Frenkel-Kontorova chain, shear thinning and viscosity are set by energy drops at mechanical instabilities, not by thermally activated barrier crossing, so Eyring fits can be coincidental.