  The dynamics of the excitation energy transfer (EET) in photosynthetic
complexes is an interesting question both from the perspective of fundamental
understanding and the research in artificial photosynthesis. Challenges persist
in numerically simulating these systems both in parameterizing them and
following their dynamics over long periods of time. Over the past decade, very
accurate spectral densities have been developed to capture spatial
inhomogeneties in the Fenna-Matthews-Olson (FMO) complex. We investigate the
dynamics of FMO with an exact treatment of various theoretical spectral
densities. Because FMO has Hamiltonian elements that connect most of the
bacteriochlorophyll sites together, it becomes difficult to rigorously identify
the energy transport pathways in the complex. We use the recently introduced
ideas of relating coherence to population derivatives to analyze the transport
process and reveal some of the pathways.
