NUCLEAR-MATTER IN NONLINEAR SIGMA-MODEL

In a simple version of the nonlinear sigma model the nuclear matter be haves as a system of nucleons interacting via two-body forces with a r adius which decreases with increasing density. This allows us to apply the Khodel-Shaginyan method which is adjusted to our approach by taki ng into account the pseudoscalar-isovector symmetry of pion field and both the scalar and pseudoscalar effective interactions. In contrast t o the QHD [1] there is no vacuum corrections in our approach.