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.
However, the location of the peak maximum, T ∗, moved to a temperature about 2.5 times higher than for very weak coupling (Fig
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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.