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On the radar method in general-relativistic spacetimes

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arxiv 0708.0170 v1 pith:P7CSALQ5 submitted 2007-08-01 gr-qc

Volker Perlick This is my paper · ORCID
classification gr-qc
keywords methodclockgeneral-relativisticradaraspectsassignsclosecurve
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If a clock, mathematically modeled by a parametrized timelike curve in a general-relativistic spacetime, is given, the radar method assigns a time and a distance to every event which is sufficiently close to the clock. Several geometric aspects of this method are reviewed and their physical interpretation is discussed.

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  1. Observer Time from Causality in Perturbative Quantum Gravity

    hep-th 2025-06 conditional novelty 5.0 of 10

    A lightbulb-and-mirror protocol defines diffeomorphism-invariant elapsed proper time, and its leading quantum gravity correction makes the time a noncommuting quantum operator.

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