Multi-Time Measurements in Hawking Radiation: Information at Higher-Order Correlations
arXiv:1909.00438 · doi:10.1088/1361-6382/ab5eb2
Abstract
It is believed that no information can be stored in Hawking radiation, because correlations between quanta of different field modes vanish. However, such correlations have been defined only with reference to a single moment of time. In this article, we develop a method for the evaluation of {\em multi-time} correlations. We find that these correlations are highly non-trivial: for a scalar field in the Schwarzschild black hole, multi-time correlations have an explicit dependence on angular variables and on the scattering history of Hawking quanta. This result leads us to the conjecture that some pre-collapse information can be stored in multi-time correlations after backreaction effects have been incorporated in the physical description.
35 pages, 3 figures. Minor changes, some references added, version to appear in Class. Quant. Grav
References in corpus (8)
- Quantum Non-Markovianity: Characterization, Quantification and Detection
- Non-Markovian time evolution of an accelerated qubit
- Probing the Unruh effect with an accelerated extended system
- Time of arrival and localization of relativistic particles
- Asymptotic states of accelerated detectors and universality of the Unruh effect
- Time-of-arrival correlations
- Time-of-arrival probabilities and quantum measurements: II Application to tunneling times
- Time-of-arrival probabilities and quantum measurements: III Decay of unstable states