On 3-dimensional (quantum) gravity (general relativity) with cosmological constant, and its (non-)relation to Chern-Simons theory with non-compact gauge groups (cf. AdS3/CFT2):
Scott Collier, Lorenz Eberhardt, Mengyang Zhang: Solving 3d Gravity with Virasoro TQFT, SciPost Phys. 15 151 (2023) [dou:10.21468/SciPostPhys.15.4.151, arXiv:2304.13650]
Alexandre Belin, Scott Collier, Lorenz Eberhardt, Diego Liska, Boris Post: A universal sum over topologies in 3d gravity [arXiv:2601.07906]
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