The projection of a mechanical system onto the irreversible generalized Langevin equation

The so-called irreversible generalized Langevin equation [R. Hernandez and F. L. Somer, J. Phys. Chem. B 103, 1064 (1999)], which extends the generali zed Langevin equation (stochastic dynamics) to include irreversible changes -nonstationarity-in the solvent response, is shown to be the projection of an explicit time-dependent Hamiltonian system. (C) 1999 American Institute of Physics. [S0021-9606(99)50941-0].