Abstract
The two-pion exchange contributions to nucleon-nucleon forces are calculated from our knowledge of pion-nucleon phase shifts and pion-pion interaction which are used as input into dispersion relations with the subtractions required by Regge asymptotic behavior. At low energies, nucleon-nucleon potentials are derived, which, with the addition of $\ensuremath{\pi}$-meson and $\ensuremath{\omega}$-meson exchange, explain many features of the phenomenological potentials without any adjustable parameter. However, the calculated spin-orbit and central potentials have significant nonlocal components at small distances.
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