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arXiv 0909.1790hep-thgr-qchep-ph
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有限温度AdS/QCD模型中的黑洞拟正规模和标量胶球

Black-hole quasinormal modes and scalar glueballs in a finite-temperature AdS/QCD model

Alex S. Miranda, C. A. Ballon Bayona, Henrique Boschi-Filho, Nelson R. F. Braga

摘要:

利用全息AdS/QCD软壁模型研究了有限温度等离子体中标量胶球的光谱。在这个模型中,胶球被描述为一个无质量的标量场在一个AdS_5黑洞与软壁背景上的一个标志。利用AdS/CFT公式计算了边界延迟格林函数。相应的热谱函数显示在低温下的准粒子峰。我们还计算了软壁黑洞几何中标量场的准正规模。这些模式的温度和动量的依赖性进行了分析。谱函数的峰的位置和宽度与准正规模的频率有关。我们的数值结果发现采用幂级数方法和计算的Breit-Wigner共振。

英文摘要:

We use the holographic AdS/QCD soft-wall model to investigate the spectrum of scalar glueballs in a finite temperature plasma. In this model, glueballs are described by a massless scalar field in an AdS_5 black hole with a dilaton soft-wall background. Using AdS/CFT prescriptions, we compute the boundary retarded Green's function. The corresponding thermal spectral function shows quasiparticle peaks at low temperatures. We also compute the quasinormal modes of the scalar field in the soft-wall black hole geometry. The temperature and momentum dependences of these modes are analyzed. The positions and widths of the peaks of the spectral function are related to the frequencies of the quasinormal modes. Our numerical results are found employing the power series method and the computation of Breit-Wigner resonances.

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