Density Dependence of Mass and Radius of a Nucleon and Quark Condensate in Nuclear Matter

Key words: 
• nucleon mass /
• nucleon radius /
• quark condensate /
• density dependence /
• chiral symmetry

Abstract: The status of the investigations on the nucleon mass, nucleon radius and quark condensate in the framework of QCDinspired models and QCD effective field theories is briefly reviewed. The results in the global color symmetry model (GCM) are described a little detailedly. The calculated results indicate that, before the maximal density is reached, the mass of a nucleon in nuclear
matter decreases, the radius of a nucleon and the quark condensate increase very slowly, with the increase of the nuclear matter density. As the maximal nuclear matter density is reached, the mass of the nucleon vanishes gradually. The radius becomes infinite and the quark condensate vanishes suddenly. A new mechanism for the chiral symmetry restoration in nuclear matter is proposed.