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We present a theoretical analysis of exciton transfer and decoherence effectsin a photosynthetic dimer interacting with collective (correlated) and local(uncorrelated) protein-solvent environments. Our approach is based on theframework of the spin-boson model. We derive explicitly the thermal relaxationand decoherence rates of the exciton transfer process, valid for arbitrarytemperatures and for arbitrary (in particular, large) interaction constantsbetween the dimer and the environments. We establish a generalization of theMarcus formula, giving reaction rates for dimer levels possibly individuallyand asymmetrically coupled to environments. We identify rigorously parameterregimes for the validity of the generalized Marcus formula.  The existence of long living quantum coherences at ambient temperaturesemerges naturally from our approach.

Dynamics of a Chlorophyll Dimer in Collective and Local Thermal Environments