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arXiv 1208.3534hep-th
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超弦在近极值NS5上的热力学和有效Hagedorn行为

Thermodynamics of Superstring on Near-extremal NS5 and Effective Hagedorn Behavior

Yuji Sugawara

摘要:

研究了近极值黑NS 5膜背景下超弦的几何环面配分函数。精确的配分函数已经在我们以前的工作的帮助下计算:[arXiv:1012.5721 [hep-th]],[arXiv:1109.3365 [hep-th]],并自然地分解成两部分。第一部分来自于在渐近区域中自由传播的弦,它被确定为在霍金温度下的超弦气体。第二部分包括在“雪茄头”附近的贡献,它表征了非极值性。值得注意的是,后一部分包括具有非零热缠绕的无质量激发,这意味着即使霍金温度远低于哈格多恩温度,哈格多恩行为也有效地出现了。我们还探讨了高温背景下定义的沿欧几里德时间方向的轨道折叠。在这些情况下,周围的尖端局部化的热绕组模式被发现是快子,反映了由orbifolding所造成的欧几里得背景的奇异性。

英文摘要:

We study the thermodynamical torus partition function of superstring on the near-extremal black NS5-brane background. The exact partition function has been computed with the helps of our previous works:[arXiv:1012.5721 [hep-th]], [arXiv:1109.3365 [hep-th]], and naturally decomposed into two parts. The first part is contributed from strings freely propagating in the asymptotic region, which are identified as the superstring gas at the Hawking temperature on the linear-dilaton background. The second part includes the contribution localized around the `tip of cigar', which characterizes the non-extremality. Remarkably, the latter part includes massless excitations with non-vanishing thermal winding, which signifies that the Hagedorn-like behavior effectively appears, even though the Hawking temperature is much lower than the Hagedorn temperature. We also explore the high-temperature backgrounds defined by the orbifolding along the Euclidean time direction. In those cases, the thermal winding modes localized around the tip are found to be tachyonic, reflecting the singularities of Euclidean backgrounds caused by orbifolding.

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