Generalized symmetry in dynamical gravity
Mar 4, 2024
60 pages
Published in:
- JHEP 10 (2024) 007
- Published: Oct 1, 2024
e-Print:
- 2403.01837 [hep-th]
Report number:
- CALT-TH 2024-009
View in:
Citations per year
Abstract: (Springer)
We explore generalized symmetry in the context of nonlinear dynamical gravity. Our basic strategy is to transcribe known results from Yang-Mills theory directly to gravity via the tetrad formalism, which recasts general relativity as a gauge theory of the local Lorentz group. By analogy, we deduce that gravity exhibits a one-form symmetry implemented by an operator U labeled by a center element α of the Lorentz group and associated with a certain area measured in Planck units. The corresponding charged line operator W is the holonomy in a spin representation ρ, which is the gravitational analog of a Wilson loop. The topological linking of U and W has an elegant physical interpretation from classical gravitation: the former materializes an exotic chiral cosmic string defect whose quantized conical deficit angle is measured by the latter. We verify this claim explicitly in an AdS-Schwarzschild black hole background. Notably, our conclusions imply that the standard model exhibits a new symmetry of nature at scales below the lightest neutrino mass. More generally, the absence of global symmetries in quantum gravity suggests that the gravitational one-form symmetry is either gauged or explicitly broken. The latter mandates the existence of fermions. Finally, we comment on generalizations to magnetic higher-form or higher-group gravitational symmetries.Note:
- 60 pages, 13 figures
- Global Symmetries
- Wilson, ’t Hooft and Polyakov loops
- Spacetime Singularities
- group: Lorentz
- cosmic string: chiral
- spin: representation
- symmetry: global
- neutrino: mass
- black hole: background
- gravitation: classical
References(128)
Figures(22)
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