多电荷全息术的味依赖QCD临界端点和双通道涨落
Flavor-Dependent QCD Critical Endpoint and Dual-Channel Fluctuations from Multi-Charge Holography
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中文总结 AI 辅助
该研究构建含多守恒电荷的全息QCD框架，通过引入规范场容纳耦合化学势格局，校准后对有限密度热力学有预测力。发现电荷和奇异密度影响临界端点位置，绘制冻结轨迹涵盖HRG拟合，高阶累积比有临界峰，为寻找QCD临界点提供策略。
中文摘要 AI 辅助
我们构建了一个包含多个守恒电荷的热力学自洽全息QCD框架。通过引入三个独立的体空间$U(1)$规范场，我们的爱因斯坦 - 麦克斯韦 - 伸缩子（EMsD）模型自然地容纳了现实重离子碰撞中固有的耦合化学势格局$(\mu_B, \mu_Q, \mu_S)$。关键在于，在全息重整化层面强制实现热力学一致性，确保精确的麦克斯韦交叉导数关系而无需特设修补。该模型仅在零密度下校准，对有限密度热力学具有真正的预测能力。我们发现有限电荷和奇异密度会在临界端点（CEP）位置引起明显的非单调位移。此外，通过绘制冻结轨迹，我们证明允许的参数带有力地涵盖了经验强子共振气体（HRG）拟合。在这个物理区域内，净重子和净电荷通道的高阶累积比在$\sqrt{s_{NN}} \approx 5\text{--}7\,\text{GeV}$处呈现出相干的临界峰。这种分层双通道特征为正在进行的寻找QCD临界点的实验提供了一种决定性的、无背景的策略。
英文摘要
We construct a thermodynamically self-consistent holographic QCD framework incorporating multiple conserved charges. By introducing three independent bulk $U(1)$ gauge fields, our Einstein-Maxwells-dilaton (EMsD) model naturally accommodates the coupled chemical potential landscape $(μ_B, μ_Q, μ_S)$ inherent to realistic heavy-ion collisions. Crucially, thermodynamic consistency is enforced at the level of holographic renormalization, ensuring exact Maxwell cross-derivative relations without ad hoc patching. Calibrated exclusively at zero density, the model exhibits genuine predictive power for finite-density thermodynamics. We reveal that finite charge and strangeness densities induce pronounced nonmonotonic shifts in the critical endpoint (CEP) location. Furthermore, by mapping the freeze-out trajectories, we demonstrate that the allowed parameter bands robustly encompass empirical hadron resonance gas (HRG) fits. Within this physical regime, higher-order cumulant ratios for both net-baryon and net-charge channels exhibit coherent critical peaks at $\sqrt{s_{NN}} \approx 5\text{--}7\,\text{GeV}$. This hierarchical dual-channel signature provides a decisive, background-free strategy for the ongoing experimental search for the QCD critical point.
