Spin-boson systems model parameters

The last term involves derivatives with respect to both mapping and environmental variables. Its contribution is difficult to compute. Calculations on the spin-boson model have shown that even if the last term is neglected, excellent agreement with the exact results for a wide range of system parameters is obtained [53]. 

Even though there appear many variables and parameters in the equations above, ultimately the spin-boson model, as advertised in [13], is characterized completely by a well defined average property of the system, the spectral function J oj)... 

The key new aspect of our investigation is two-fold first, we base all model parameters on molecular dynamics simulations second, the spin-boson model allows one to account for a very large number of vibrations quantum mechanically. We have demonstrated that the spin-boson model is well suited to describe the coupling between protein motion and electron transfer in biological redox systems. The model, through the spectral function can be matched to correlation functions of the redox energy... 

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