The phase structure of baryonic matter is investigated with focus on the role of fluctuations beyond the mean-field approximation. The prototype test case studied is the chiral nucleon-meson model, with added comments on the chiral quark-meson model. Applications to nuclear matter include the liquid-gas phase transition. Extensions to high baryon densities are performed for both nuclear and neutron matter. The role of vacuum fluctuations is systematically explored. It is pointed out that such fluctuations tend to stabilize the hadronic phase characterized by spontaneously broken chiral symmetry, shifting the chiral restoration transition to very high densities. This stabilization effect is shown to be further enhanced by additional dynamical fluctuations treated with functional renormalisation group methods.

研究了重子物质的相结构，重点是超出平均场近似值的波动的作用。研究的原型测试案例是手性核子-介子模型，并添加了对手性夸克-介子模型的评论。核物质的应用包括液-气相变。对核物质和中子物质都进行了高重子密度的扩展。系统地探讨了真空波动的作用。有人指出，这种波动倾向于稳定以自发破坏手征对称性为特征的强子相，将手征恢复过渡转移到非常高的密度。通过使用功能重整化组方法处理的额外动态波动，显示出这种稳定效果进一步增强。