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2024

Relativity of the event: examples in JT gravity and linearized GR

Nitti, Francesco, Piazza, Federico, Taskov, Alexander

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Observables in quantum gravity are famously defined asymptotically, at the boundary of AdS or Minkowski spaces.

However, by gauge fixing a coordinate system or suitably dressing the field operators, an approximate, "quasi-local" approach is also possible, that can give account of the measurements performed by a set of observers living inside the spacetime.
In particular, one can attach spatial coordinates to the worldlines of these observers and use their proper times as a time coordinate.
Here we highlight that any such local formulation has to face the relativity of the event, in that changing frame (= set of observers) implies a reshuffling of the point-events and the way they are identified.

Relativity of the event: examples in JT gravity and linearized GR · Around

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