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arXiv 1306.2929hep-thhep-phnucl-th
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强耦合各向异性等离子体中静电势的虚部

The Imaginary Part of the Static Potential in Strongly Coupled Anisotropic Plasma

Kazem Bitaghsir Fadafan, Dimitrios Giataganas, Hesam Soltanpanahi

摘要:

利用规范/引力对偶性研究了有限温度强耦合各向异性等离子体中与热宽度相关的静势虚部。我们首先推导出一个通用的各向异性背景的潜力。然后,我们将我们的公式的理论,其中各向异性已产生的空间依赖的轴子项。我们发现,使用我们的方法存在着一个特殊的转折点,在虚部的潜力,类似于一个出现在实部。各向异性的存在导致虚势的减小,当温度保持不变时,虚势沿各向异性方向减小较大。当熵密度一定时,沿平行方向熵密度增加,沿横截面熵密度减小。为了估计的热宽度,我们使用一个近似的外推超出转折点,我们发现在存在的各向异性,独立的比较方案使用的减少。

英文摘要:

Using the gauge/gravity duality we study the imaginary part of the static potential associated to the thermal width in finite temperature strongly coupled anisotropic plasma. We firstly derive the potential for a generic anisotropic background. Then we apply our formulas to a theory where the anisotropy has been generated by a space dependent axion term. We find that using our method there exist a peculiar turning point in the imaginary part of the potential, similar to the one appearing in the real part. The presence of anisotropy leads to decrease of the imaginary potential, where larger decrease happens along the anisotropic direction when the temperature is kept fixed. When the entropy density is fixed, increase happens along the parallel direction while along the transverse plane we observe a decrease. To estimate the thermal width we use an approximate extrapolation beyond the turning point and we find a decrease in presence of the anisotropy, independently of the comparison scheme used.

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