Density dependence of meson - nucleon vertices in nuclear matter
  Changes in the meson-nucleon coupling constant and the vertex form factor in nuclear matter are studied in a modified Skyrme Lagrangian including the sigma-meson field that satisfies the scale invariance. Renormalization of the axial-vector coupling constant, and the nucleon mass are studied in a consistent model. The results are consistent with the empirical evidence. A calculation of pi N commutator, sigma-term, indicates that the medium changes its magnitude considerably. 
A.M. Rakhimov (Institute of Nuclear Physics, Academy of Science,   Tashkent, Uzbekistan), F.C. Khanna (University of Alberta...