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arXiv 0806.0152hep-th
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关于HQCD模型的标量介子谱

On the spectra of scalar mesons from HQCD models

Oded Mintakevich, Jacob Sonnenschein

备注：
22 pages, 12 figures
发表信息：
JHEP0808:082,2008
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摘要：

我们从味D膜探针嵌入HQCD模型的涨落中确定了标量介子的全息谱。我们考虑的模型包括Sakai Sugimoto模型在零温度和“高温中间阶段”的推广，其中系统处于去澄清阶段，同时承认手征对称性破缺，以及非临界的零温度下的6d模型。所有这些模型都是基于与近极值N_c D_4膜和一组允许几何手征对称性破缺的N_f<<N_c味探测膜有关的背景。我们指出这些模型的谱包含了一个自然界中不存在的0^{--}分支。在零温下，我们发现介子的质量M_n依赖于“组分夸克质量”参数m^c_q和激发数n，在十维情况下，M_n依赖于M_n^2m ^c_q和M_n2 n^{1.7}，在非临界情况下，M_n依赖于M_nm ^c_q和M_nn ^{0.75}。在高温的中间阶段，我们检测到的低自旋介子的质量作为温度的函数类似于全息矢量介子和晶格计算的减少。

英文摘要：

We determine the holographic spectra of scalar mesons from the fluctuations of the embedding of flavor D-brane probes in HQCD models. The models we consider include a generalization of the Sakai Sugimoto model at zero temperature and at the "high-temperature intermediate phase", where the system is in a deconfining phase while admitting chiral symmetry breaking and a non-critical 6d model at zero temperature. All these models are based on backgrounds associated with near extremal N_c D4 branes and a set of N_f<<N_c flavor probe branes that admit geometrical chiral symmetry breaking. We point out that the spectra of these models include a 0^{--} branch which does not show up in nature. At zero temperature we found that the masses of the mesons M_n depend on the "constituent quark mass" parameter m^c_q and on the excitation number n as M_n^2 m^c_q and M^2_n n^{1.7} for the ten dimensional case and as M_n m^c_q and M_n n^{0.75} in the non-critical case. At the high temperature intermediate phase we detect a decrease of the masses of low spin mesons as a function of the temperature similar to holographic vector mesons and to lattice calculations.

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