Holographic Lorentz and Carroll Frames

Abstract

Relaxing the Bondi gauge, the solution space of three-dimensional gravity in the metric formulation has been shown to contain an additional free function that promotes the boundary metric to a Lorentz or Carroll frame, in asymptotically AdS or flat spacetimes. We pursue this analysis and show that the solution space also admits a finite symplectic structure, obtained taking advantage of the built-in ambiguities. The smoothness of the flat limit of the AdS symplectic structure selects a prescription in which the holographic anomaly appears in the boundary Lorentz symmetry, that rotates the frame. This anomaly turns out to be cohomologically equivalent to the standard holographic Weyl anomaly and survives in the flat limit, thus predicting the existence of quantum anomalies in conformal Carrollian field theories. We also revisit these results in the Chern--Simons formulation, where the prescription for the symplectic structure admitting a smooth flat limit follows from the variational principle, and we compute the charge algebra in the boundary conformal gauge.

arXiv comment34+9 pages

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• Hydro & Thermo Dynamics at Causal Boundaries, Examples in 3d Gravity
• Logarithmic Celestial Conformal Field Theory
• Symmetries and Charges in Weyl-Fefferman-Graham Gauge
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• Carroll Hawking effect
• Higher-spin gauge theories in three spacetime dimensions
• BRST Cohomology is Lie Algebroid Cohomology
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