What is the curvature of 2D Euclidean quantum gravity?
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作者:
R. Loll
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机构:
Radboud University,Institute for Mathematics, Astrophysics and Particle PhysicsRadboud University,Institute for Mathematics, Astrophysics and Particle Physics
R. Loll
[1
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T. Niestadt
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机构:
Perimeter Institute for Theoretical Physics,undefinedRadboud University,Institute for Mathematics, Astrophysics and Particle Physics
T. Niestadt
[2
]
机构:
[1] Radboud University,Institute for Mathematics, Astrophysics and Particle Physics
[2] Perimeter Institute for Theoretical Physics,undefined
2D Gravity;
Models of Quantum Gravity;
Lattice Models of Gravity;
D O I:
10.1007/JHEP04(2025)158
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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.
机构:
Univ Copenhagen, Niels Bohr Inst, DK-2100 Copenhagen O, Denmark
Radboud Univ Nijmegen, Inst Math Astrophys & Particle Phys, NL-6525 AJ Nijmegen, NetherlandsUniv Copenhagen, Niels Bohr Inst, DK-2100 Copenhagen O, Denmark
Ambjorn, Jan
Glaser, Lisa
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Univ Copenhagen, Niels Bohr Inst, DK-2100 Copenhagen O, DenmarkUniv Copenhagen, Niels Bohr Inst, DK-2100 Copenhagen O, Denmark
Glaser, Lisa
Sato, Yuki
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机构:
Nagoya Univ, Dept Phys, Nagoya, Aichi 4648602, JapanUniv Copenhagen, Niels Bohr Inst, DK-2100 Copenhagen O, Denmark
Sato, Yuki
Watabiki, Yoshiyuki
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机构:
Tokyo Inst Technol, Dept Phys, High Energy Theory Grp, Meguro Ku, Tokyo 1528551, JapanUniv Copenhagen, Niels Bohr Inst, DK-2100 Copenhagen O, Denmark
机构:
CEA Saclay, Serv Phys Theor, CNRS, URA 2306, F-91191 Gif Sur Yvette, FranceCEA Saclay, Serv Phys Theor, CNRS, URA 2306, F-91191 Gif Sur Yvette, France
Kostov, Ivan
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT,
2007,