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Energies of symmetric nuclear matter and neutron matter are evaluated in thelowest order Bruekner theory using the Ch-EFT potential including effects ofthe three-nucleon force (3NF). The 3NF is first reduced to density-dependentnucleon-nucleon (NN) force by folding single-nucleon degrees of freedom ininfinite matter. Adding the reduced NN force to the initial NN force andapplying a partial-wave expansion, we perform $G$-matrix calculations in pureneutron matter as well as in symmetric nuclear. We obtain the saturation curvewhich is close to the empirical one. It is explicitly shown that thecutoff-energy dependence of the calculated energies is substantially reduced byincluding the 3NF. Characters of the 3NF contributions in separate spin andisospin channels are discussed. Calculated energies of the neutron matter arevery similar to those used in the literature for considering neutron starproperties.

Nuclear and neutron matter $G$-matrix calculations with Ch-EFT potential including effects of three-nucleon interaction