Effects of nonlocality in time of interactions of an atom with its surroundings on the broadening of spectral lines of atoms

We investigate effects of nonlocality in time of the interaction of an atom with its surroundings on the spectral line broadening. We show that these effects can be very significant: In some cases nonlocality in time of this interaction can give rise to a spectral line splitting.Comment: 15 pages, 4 figures, to be published in Physics Letters

Nonlocality of the NN interaction in an effective field theory

We investigate low energy nucleon dynamics in the effective field theory (EFT) of nuclear forces. In leading order of the two-nucleon EFT we show that nucleon dynamics is governed by the generalized dynamical equation with a nonlocal-in-time interaction operator. This equation is shown to open new possibilities for applying the EFT approach to the description of low energy nucleon dynamics.Comment: 13 pages, 4 figures, REVTeX