Nuclear Forces from Chiral Dynamics
  We show that from analysis of time-ordered diagrams for the two-nucleon $T$-matrix in chiral perturbation theory it follows that low energy nucleon dynamics is governed by the generalized dynamical equation, which was derived in [J.Phys.A., v.32, p.5657 (1999)], with a nonlocal-in-time interaction operator. An operator is presented that parametrizes the nucleon-nucleon interaction in the 1S0 channel at leading order of the Weinberg power counting. 
Renat Kh.Gainutdinov and Aigul A.Mutygullina