Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1996-03-06
Nucl.Phys. A603 (1996) 239-256
Physics
Nuclear Physics
Nuclear Theory
24 pages, LaTex, 7 PostScript Figures, a couple of misprints corrected , 2 references added, a few modifications of the main t
Scientific paper
10.1016/0375-9474(96)80001-8
We study the evolution with density of the quark condensate in the nuclear medium with interacting nucleons and including the short range correlations. We work with two chiral models, the linear sigma model and the non-linear one. For the last one we use two versions, one which does not satisfy PCAC, and another one which does. We show that the quark condensate, as other observables, is independent on the variant selected. The application to physical pions excludes the linear sigma model as a credible one. In the non-linear models our conclusions are: first there is no systematic reaction imposed by chiral symmetry against symmetry restoration, second, if one keeps only the s-wave pion-nucleon interaction, the quark condensate evolves essentially linearly with density, as if the nucleons were non interacting. The main correction arises from the p-wave pion-nucleon interaction. Last, in the s-wave optical potential, chiral symmetry tolerates but does not impose two body terms. On the other hand the effect of correlations linked to the isospin symmetric amplitude is negligible.
Chanfray Guy
Delorme Jean
Ericson Magda
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