Multilayer neutron stars with scalar mesons crossing term

Level crossing of particle-hole and mesonic modes in eta mesic nuclei

We study eta meson properties in the infinite nuclear matter and in atomic nuclei with an emphasis on effects of the eta coupling to N*(1535)--nucleon-hole modes. The N*(1535) resonance, which dominates the low-energy eta-nucleon scattering, can be seen as a chiral partner of the nucleon. The change of the chiral mass gap between the N* and the nucleon in a nuclear medium has an impact on the properties of the eta-nucleus system. If the N*-nucleon mass gap decreases with a density increase (chiral symmetry restoration) the calculations show the existence of the resonance state at the energy ab…

Influence of the interactions of scalar mesons on the behavior of the symmetry energy

Symmetry energy behavior of scalar mesons interactions is analyzed within the framework of the standard relativistic mean field model. Whereas the presence of the $δ$ meson itself makes the symmetry energy stiffer, the crossing term $δ\textrm{-}σ$ allows its slope to decrease to the suggested experimental value. Moreover, such controlling of the symmetry energy does not significantly affect the stiffness of the equation of state and acceptable neutron star masses result. Interestingly, for the most plausible value of the symmetry energy slope, the phase transition occurs in the neutron star co…

On meson resonances and chiral symmetry

We study meson resonances with quantum numbers J^P=1^+ in terms of the chiral SU(3) Lagrangian. At leading order a parameter-free prediction is obtained for the scattering of Goldstone bosons off vector mesons with J^P=1^- once we insist on approximate crossing symmetry of the unitarized scattering amplitude. A resonance spectrum arises that is remarkably close to the empirical pattern. In particular, we find that the strangeness-zero resonances h_1(1380), f_(1285) and b_1(1235) are formed due to strong K \bar K_μand \bar K K_μchannels. This leads to large coupling constants of those resonance…

全息导体中介子的 Stark 效应与解离

Stark effect and dissociation of mesons in holographic conductor

本文利用 D3/D7 模型研究有限电场下超对称 Yang-Mills 理论的介子谱，通过分析 D7-brane 涨落的准正则模式，探讨了电场导致的 Stark 效应、介子解离相变及能级间的避免交叉现象。

用于 HESS J1731-347 超紧致低质量中子星的相对论平均场模型

Relativistic mean field model for ultra-compact low mass neutron star of HESS J1731-347

针对 HESS J1731-347 所示极轻超致密中子星对状态方程的挑战，本文构建含同位旋矢量与同位旋标量介子交叉项的相对论平均场模型，以再现小半径并满足 NICER、GW170817 等约束。

研究致密天体HESS J1731-347存在厚壳层的可能性

Examining the possibility of a thick crust in the compact stellar object HESS J1731-347

本研究基于克拉科夫交叉项（CCT）模型，补充相变处理后发现致密天体HESS J1731-347的中子星核心可形成延伸至壳层的混合相，存在厚且大质量的壳层。