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Thermodynamics of superstring on near-extremal NS5 and effective Hagedorn behavior

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Abstract

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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Authors and Affiliations

  1. Department of Physical Science, College of Science and Engineering, Ritsumeikan University, Shiga, 525-8577, Japan

    Yuji Sugawara

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  1. Yuji Sugawara
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Correspondence to Yuji Sugawara.

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ArXiv ePrint: 1208.3534

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Sugawara, Y. Thermodynamics of superstring on near-extremal NS5 and effective Hagedorn behavior. J. High Energ. Phys. 2012, 159 (2012). https://doi.org/10.1007/JHEP10(2012)159

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