Electromagnetic instability and Schwinger effect in the Witten-Sakai-Sugimoto model with D0-D4 background
Electromagnetic instability and Schwinger effect in the Witten-Sakai-Sugimoto model with D0-D4 background
复制标题
D0-D4 背景下 Witten-Sakai-Sugimoto 模型中的电磁不稳定性和 Schwinger 效应
DOI：
10.1140/epjc/s10052-019-7404-1
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发表时间：
2019
影响因子：
4.4
通讯作者：
Li Si-wen
中科院分区：
文献类型：
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作者：
Cai Wenhe;Li Kang-le;Li Si-wen
在D_0-D_4背景下，利用Witten-Sakai-Sugimoto模型，我们用全息方法计算了该模型中Schwinger效应的真空衰减率。我们的计算包含了D 0-膜密度的影响，D 0-膜密度可以用QCD中的角势或手征势来表示。在强电磁场作用下，由于夸克-反夸克对的产生而出现不稳定性，通过计算有效Euler-Heisenberg作用量的虚部可以得到相应的衰变率，该作用量被确定为探测膜与恒定电磁场的作用量.在气泡D 0-D4构型中，我们发现由于胶凝物的存在，真空度变重，随着角度的增大，衰变率减小。在零温极限下，衰变率与我们计算的黑D 0-D4组态的结果一致。在这个意义上，该模型的Hawking-Page转变可以一致地解释为受限/非受限相变。此外，在这个系统中还有另一种来自D 0-膜本身的不稳定性，我们认为这种不稳定性反映了在依赖QCD中已知的由角度触发的真空衰变。
Using the Witten–Sakai–Sugimoto model in the D0–D4 background, we holographically compute the vacuum decay rate of the Schwinger effect in this model. Our calculation contains the influence of the D0-brane density which could be identified as theangle or chiral potential in QCD. Under the strong electromagnetic fields, the instability appears due to the creation of quark–antiquark pairs and the associated decay rate can be obtained by evaluating the imaginary part of the effective Euler–Heisenberg action which is identified as the action of the probe brane with a constant electromagnetic field. In the bubble D0–D4 configuration, we find the decay rate decreases when theangle increases since the vacuum becomes heavier in the present of the glue condensate in this system. And the decay rate matches to the result in the black D0–D4 configuration at zero temperature limit according to our calculations. In this sense, the Hawking–Page transition of this model could be consistently interpreted as the confined/deconfined phase transition. Additionally there is another instability from the D0-brane itself in this system and we suggest that this instability reflects to the vacuum decay triggered by theangle as it is known in the-dependent QCD.