Abstract
We analyze near-Hagedorn thermodynamics of strings in the WZW AdS 3 model. We compute the thermal spectrum of all primaries and find the thermal scalar explicitly in the string spectrum using CFT twist techniques. Then we use the link to the Euclidean WZW BTZ black hole and write down the Euclidean BTZ spectrum. We give a Hamiltonian interpretation of the thermal partition function of angular orbifolds where we find a reappearance of discrete states that dominate the partition function. Using these results, we discuss the nature of the thermal scalar in the WZW BTZ model. As a slight generalization of the angular orbifolds, we discuss the AdS 3 string gas with a non-zero chemical potential corresponding to angular momentum around the spatial cigar. For this model as well, we determine the thermal spectrum and the Hagedorn temperature as a function of chemical potential. Finally the nature of α′ corrections to the AdS 3 thermal scalar action is analyzed and we find the random walk behavior of highly excited strings in this particular AdS 3 background.
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Mertens, T.G., Verschelde, H. & Zakharov, V.I. The thermal scalar and random walks in AdS 3 and BTZ . J. High Energ. Phys. 2014, 156 (2014). https://doi.org/10.1007/JHEP06(2014)156
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DOI: https://doi.org/10.1007/JHEP06(2014)156