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We investigate the nature of the effective dynamics and statistical forcesobtained after integrating out nonequilibrium degrees of freedom. To beexplicit, we consider the Rouse model for the conformational dynamics of anideal polymer chain subject to steady driving. We compute the effectivedynamics for one of the many monomers by integrating out the rest of the chain.The result is a generalized Langevin dynamics for which we give the memory andnoise kernels and the effective force, and we discuss the inheritednonequilibrium aspects.

From Langevin to generalized Langevin equations for the nonequilibrium Rouse model