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.
This can be said to correspond to a body force
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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.