胶子凝聚对重夸克偶素谱函数与热解离的影响
Gluon condensate effects on heavy quarkonium spectral functions and thermal dissociation
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中文总结 AI 辅助
研究采用改进的软墙AdS/QCD模型，发现胶子凝聚可阻碍重夸克偶素在夸克胶子等离子体中的热解离，为其稳定作用提供了新全息证据。
中文摘要 AI 辅助
我们采用改进的软墙AdS/QCD模型，研究胶子凝聚如何修改重矢量介子（具体为粲夸克偶素与底夸克偶素）的热谱函数与熔解模式。该框架通过伸缩子黑洞几何扩展至有限温度，该几何一致纳入了胶子凝聚的反作用。我们数值追踪谱共振峰随温度和胶子凝聚强度的演化。计算表明，升高温度会系统性地展宽并抑制谱峰，这是介质中解离的信号；相反，更强的胶子凝聚会显著缓解峰的展宽，并增强基态与激发态的谱权重。该行为表明胶子凝聚会阻碍热解离，从而在夸克胶子等离子体中稳定重夸克偶素。这些结果与现有研究一致，且从热谱函数角度为胶子凝聚的稳定作用提供了新的全息证据。
英文摘要
We investigate how the gluon condensate modifies the thermal spectral functions and melting patterns of heavy vector mesons, specifically charmonium and bottomonium, using an improved soft-wall AdS/QCD model. The framework is extended to finite temperature via a dilaton black hole geometry that consistently incorporates the backreaction from the gluon condensate. We numerically track the evolution of spectral resonance peaks as functions of both temperature and gluon condensate strength. Our calculations reveal that increasing temperature systematically broadens and suppresses spectral peaks, signaling in-medium dissociation. In contrast, a stronger gluon condensate considerably mitigates peak broadening and enhances the spectral weight of both ground and excited states. This behavior indicates that the gluon condensate hinders thermal dissociation, thereby stabilizing heavy quarkonia within the quark-gluon plasma. These findings are consistent with existing studies and provide new holographic evidence for the stabilising role of the gluon condensate from the perspective of thermal spectral functions.
