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Speed up of dynamic observables in coarse-grained molecular-dynamics simulations of unentangled polymers.

Coarse-grained models that preserve atomistic detail display faster dynamics than atomistic systems alone. We show that this " indirect speed up" is robust: coarse-grained dynamic observables computed with time scaled by a constant factor are in excellent agreement with their underlying atomistic counterparts. Borrowing from accelerated dynamics methods used in the field of rare events, we predict the scaling factor within 7%, based on reduced intermolecular attraction yielding faster neighbor cage escapes.