String Stars in Anti de Sitter Space

Abstract

We study the `string star' saddle, also known as the Horowitz-Polchinski solution, in the middle of d+1 dimensional thermal AdS space. We show that there's a regime of temperatures in which the saddle is very similar to the flat space solution found by Horowitz and Polchinski. This saddle is hypothetically connected at lower temperatures to the small AdS black hole saddle. We also study, numerically and analytically, how the solutions are changed due to the AdS geometry for higher temperatures. Specifically, we describe how the solution joins with the thermal gas phase, and find the leading correction to the Hagedorn temperature due to the AdS curvature. Finally, we study the thermodynamic instabilities of the solution and argue for a Gregory-Laflamme-like instability whenever extra dimensions are present at the AdS curvature scale.

arXiv comment24 pages + appendices (9 figures); v2: minor changes and added references

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• The correspondence between rotating black holes and fundamental strings
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• Semiclassical Quantization of the Superstring and Hagedorn Temperature
• Hagedorn temperature in holography: world-sheet and effective approaches
• On the Entropy of Strings and Branes
• Black Hole Entropy, Quantum Corrections and EFT Transitions
• Holographic Hagedorn Temperature: Strong Coupling, Flavor and $\theta$-angle Effects
• Vacuum configuration of winding superstrings from non-standard semiclassical quantization
• Fiducial observers and the thermal atmosphere in the black hole quantum throat