Critical time scale of coarse-graining entropy production.

  title={Critical time scale of coarse-graining entropy production.},
  author={Jang-il Sohn},
  journal={Physical review. E},
We study coarse-grained entropy production in an asymmetric random walk system on a periodic one-dimensional lattice. In coarse-grained systems, the original dynamics are unavoidably destroyed, but the coarse-grained entropy production is not hidden below the critical time-scale separation. The hidden entropy production is rapidly increasing near the critical time-scale separation.