同位旋不平衡对手征对偶伙伴模型中手征相变的影响
Effects of isospin imbalance on the chiral phase transition within a Chiral Dual Partner Model
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中文总结 AI 辅助
研究人员利用手征对偶伙伴模型，分析了同位旋不平衡下致密核物质中的手征相变，发现奇宇称重子的出现与热力学不稳定性分支相关，低温下会引发一阶相变，并将中子星物质作为特殊情况展开研究。
中文摘要 AI 辅助
手征对称性是强相互作用基础理论的一种性质，与强子物理相关，预计在足够高的温度和物质密度下，该对称性会显现。手征对偶伙伴模型中，手征变换的实现方式为：若框架中包含每个重子的宇称伙伴，则允许费米子质量项。本文利用该模型，在假设同位旋分数恒定的情况下，研究致密核物质中手征对称性的可能显现。研究发现，奇宇称重子的出现与热力学不稳定性的两个分支相关，其中一个分支在温度低于$T_c\backsimeq11$ MeV时会引发一阶相变。本文对相空间中的这些不稳定性进行了分析，并将中子星物质作为特殊情况加以考虑。
英文摘要
The chiral symmetry is a property of the fundamental theory of the strong interaction that is relevant for the hadronic physics. It is expected that at sufficiently high temperature and matter density, this symmetry becomes manifest. Within the Chiral Dual Partner Model the chiral transformation is implemented in such a way that a fermion mass term is allowed if the parity partner of each baryon is included in the framework. This model is used here to study possible manifestations of the chiral symmetry in dense nuclear matter, assuming constant isospin fraction. It is found that the onset of the odd parity baryons is associated with two branches of thermodynamical instabilities, one of them leads to a first order phase transition for temperatures below $T_c\simeq 11$ MeV. An analysis of these instabilities in the phase space is given, and neutron star matter is considered as a special case.
发表机构
- Departamento de Matematica, Universidad Nacional de La Plata（拉普拉塔国立大学数学系）
- Instituto de Fisica La Plata, CONICET（拉普拉塔物理研究所，阿根廷国家科学研究委员会）
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