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Clocks and Rods in Jackiw-Teitelboim Quantum Gravity
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We specify bulk coordinates in Jackiw-Teitelboim (JT) gravity using a boundary-intrinsic radar definition. This allows us to study and calculate exactly diff-invariant bulk correlation functions of matter-coupled JT gravity, which are found to satisfy microcausality. We observe that quantum gravity effects dominate near-horizon matter correlation functions. This shows that quantum matter in classical curved spacetime is not a sensible model for near-horizon matter-coupled JT gravity. This is how JT gravity, given our choice of bulk frame, evades an information paradox. This echoes into the quantum expectation value of the near-horizon metric, whose analysis is extended from the disk model to the recently proposed topological completion of JT gravity. Due to quantum effects, at distances of order the Planck length to the horizon, a dramatic breakdown of Rindler geometry is observed.
Forward citations
Cited by 7 Pith papers
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Relational path integral, effective actions and quantum frame covariance in gravity
The gravitational path integral is reformulated with dynamical reference frames, producing gauge-invariant correlators, frame-dependent vacua, and effective actions, with sharpness of events becoming frame-relative.
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JT gravity on the worldline
Coupling a worldline observer to JT gravity replaces its evolution operator by an exactly computed average over fluctuating Euclidean times; the fluctuations are small in the disk but large on the double trumpet.
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Exact Schwarzian Metric Factor and Holographic Wilson-Loop Screening
Exact Schwarzian averaging yields a completely monotone metric factor with no confining minimum, so the Wilson-loop potential screens as E(L) ~ -κ_IR/L² rather than confining.
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Probabilistic Causality from Graviton Fluctuations
In a thermal state of gravitons at temperature T, metric fluctuations induce a Gaussian spread in the causal structure of a scalar field with Var(x²) = 16 G_N T t³ / 3 after vacuum subtraction.
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Falling through the horizon of a quantum black hole
Gravitational dressing in JT gravity lets an infalling Unruh-DeWitt detector detect the horizon location and temperature locally, violating the equivalence principle without a firewall.
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Quantum-Corrected Holographic Wilson Loop Expectation Values and Super-Yang-Mills Confinement
Near-horizon quantum gravity fluctuations in an extremal AdS5-Reissner-Nordström black brane make the holographic Wilson loop obey an area law, producing a linear quark-antiquark potential at zero temperature.
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Comments on firewalls in JT gravity with matter
A twist factor cutoff from eigenvalue branes reproduces the gray hole firewall probabilities in JT gravity, with matter loop corrections subleading at late times.
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