Birse, M. C.

Krippa, B. V.

McGovern, J. A.

Walet, Niels

Effective field theory requires all observables to be independent of the representation used for the quantum field operators. Off-shell parts of the in-medium vertex functions depend on the particular representation so that off-shell properties of the interactions should not lead to any observable effects. We analyze this issue in the context of many-body approaches to nuclear matter, where it should be possible to shift into three-body force the contributions from purely off-shell two-body interactions. None of the commonly used truncations of the two-body scattering amplitude such as the ladder, Brueckner-Hartree-Fock or parquet approxns. respect this requirement. [on SciFinder (R)

Off-shell effects in nuclear matter from an EFT point of view.

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