Multi-Time Measurements in Hawking Radiation: Information at Higher-Order Correlations
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.
Keywords
Cite
@article{arxiv.1909.00438,
title = {Multi-Time Measurements in Hawking Radiation: Information at Higher-Order Correlations},
author = {Charis Anastopoulos and Ntina Savvidou},
journal= {arXiv preprint arXiv:1909.00438},
year = {2020}
}
Comments
35 pages, 3 figures. Minor changes, some references added, version to appear in Class. Quant. Grav