冷致密物质中强子-夸克连续转变的证据
Evidence for a Continuous Hadron--Quark Transition in Cold Dense Matter
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中文总结 AI 辅助
通过贝叶斯模型比较，发现冷致密物质中强子-夸克转变更支持无边界交叉，而非一阶或固定边界构造，并给出大核子质量和较小配对能隙，表明统一描述需超越孤立有效模型。
中文摘要 AI 辅助
本研究发现了强子-夸克连续转变的统计证据。通过将宇称双重模型与南部-约纳-拉西尼奥模型相连接的微观描述，与观测约束的非参数状态方程进行对比，贝叶斯模型比较明确地支持无边界交叉过渡，而非传统的一阶麦克斯韦构造（$\nDelta\ln\mathcal{Z} \sim +7.20$）和固定边界交叉过渡（$\nDelta\ln\mathcal{Z} \sim +5.16$）。所偏好的交叉过渡将中间硬化与各相的内在刚度解耦，使两个扇区均能表现出物理自洽性。手征不变核子质量较大，$M_0 = 834^{+28}_{-92}\text{ MeV}$，这符合手征恢复后仍存有大量重子质量的预期。虽然夸克扇区容纳了较小的配对能隙 $\Delta_{\rm CFL} = 88^{+83}_{-59}\text{ MeV}$，与微扰QCD极限一致，但避免了其他构造所需的过大能隙 $\Delta_{\rm CFL} \gtrsim 200\text{ MeV}$。这些结果表明，一个现实的统一描述代表了一种连续转变，与孤立的强子和夸克有效模型存在显著差异。因此，有必要通过统一框架内自旋不稳定性涌现来探索真正的相边界。
英文摘要
Statistical evidence for a continuous hadron-quark transition is found in this work. Confronting microscopic descriptions connecting the Parity Doublet Model and the Nambu--Jona-Lasinio model with observationally constrained non-parametric equations of state, Bayesian model comparison decisively favors a boundary-free crossover over the conventional first-order Maxwell construction ($Δ\ln\mathcal{Z} \sim +7.20$) and fixed-boundary crossover ($Δ\ln\mathcal{Z} \sim +5.16 $). The preferred crossover decouples the intermediate stiffening from the intrinsic stiffness of each phase, allowing both sectors to exhibit physical self-consistency. The chiral-invariant nucleon mass is large, $M_0 = 834^{+28}_{-92}\text{ MeV}$, as expected for a substantial baryon mass surviving chiral restoration. While the quark sector accommodates a small pairing gap $Δ_{\rm CFL} = 88^{+83}_{-59}\text{ MeV}$ consistent with perturbative QCD limits, avoiding the excessively large gaps $Δ_{\rm CFL} \gtrsim 200\text{ MeV}$ required by the other constructions. These results demonstrate that a realistic unified description represents a continuous transition deviating substantially from isolated effective models of hadrons and quarks. Exploring genuine phase boundaries is therefore necessary through the emergence of spinodal instabilities within unified frameworks.
发表机构
- Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Science（中国科学院紫金山天文台暗物质与空间天文重点实验室）
- RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS), RIKEN（理化学研究所交叉理论数学科学中心（iTHEMS））
- Research Center for Nuclear Physics, The University of Osaka（大阪大学核物理研究中心）
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