What is the curvature of 2D Euclidean quantum gravity?

被引:0
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作者
R. Loll [1 ]
T. Niestadt [2 ]
机构
[1] Radboud University,Institute for Mathematics, Astrophysics and Particle Physics
[2] Perimeter Institute for Theoretical Physics,undefined
关键词
2D Gravity; Models of Quantum Gravity; Lattice Models of Gravity;
D O I
10.1007/JHEP04(2025)158
中图分类号
学科分类号
摘要
We re-examine the nonperturbative curvature properties of two-dimensional Euclidean quantum gravity, obtained as the scaling limit of a path integral over dynamical triangulations of a two-sphere, which lies in the same universality class as Liouville quantum gravity. The diffeomorphism-invariant observable that allows us to compare the averaged curvature of highly quantum-fluctuating geometries with that of classical spaces is the so-called curvature profile. A Monte Carlo analysis on three geometric ensembles, which are physically equivalent but differ by the inclusion of local degeneracies, leads to new insights on the influence of finite-size effects. After eliminating them, we find strong evidence that the curvature profile of 2D Euclidean quantum gravity is best matched by that of a classical round four-sphere, rather than the five-sphere found in previous work. Our analysis suggests the existence of a well-defined quantum Ricci curvature in the scaling limit.
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