JT gravity, KdV equations and macroscopic loop operators
Abstract We study the thermal partition function of Jackiw-Teitelboim (JT) gravity in asymptotically Euclidean AdS 2 background using the matrix model description recently found by Saad, Shenker and Stanford [ arXiv:1903.11115 ]. We show that the partition function of JT gravity is written as the ex...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2020-01-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP01(2020)156 |
| Summary: | Abstract We study the thermal partition function of Jackiw-Teitelboim (JT) gravity in asymptotically Euclidean AdS 2 background using the matrix model description recently found by Saad, Shenker and Stanford [ arXiv:1903.11115 ]. We show that the partition function of JT gravity is written as the expectation value of a macroscopic loop operator in the old matrix model of 2d gravity in the background where infinitely many couplings are turned on in a specific way. Based on this expression we develop a very efficient method of computing the partition function in the genus expansion as well as in the low temperature expansion by making use of the Korteweg-de Vries constraints obeyed by the partition function. We have computed both these expansions up to very high orders using this method. It turns out that we can take a low temperature limit with the ratio of the temperature and the genus counting parameter held fixed. We find the first few orders of the expansion of the free energy in a closed form in this scaling limit. We also study numerically the behavior of the eigenvalue density and the Baker-Akhiezer function using the results in the scaling limit. |
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| ISSN: | 1029-8479 |