https://doi.org/10.1140/epjs/s11734-023-01043-9
Review
The equivalence principle and inertial-gravitational quantum backreaction
1
IFGW, Unicamp, Sergio Buarque de Holanda 777, 13083859, Campinas, SP, Brazil
2
Institute of Physics, Jan Kochanowski University, Ul. Uniwersytecka 7, 25-406, Kielce, Poland
Received:
23
March
2023
Accepted:
14
November
2023
Published online:
7
December
2023
This work is divided into two parts. The first examines recent proposals for “witnessing” quantum gravity via entanglement from the point of view of Bronstein’s original objection to a quantization of gravity. Using techniques from open quantum systems, we sketch how unavoidable inertial and gravitational backreaction between probe and detector could affect the experimental detection of the quantization of gravity. We argue that this is actually an inherent feature of any quantum description that attempts to incorporate the equivalence principle exactly within quantum dynamics. In the second part, we speculate on how an exact realization of the equivalence principle might be implemented in an effective quantum field theory via the general covariance of correlators. While we are far from giving an explicit construction of such a theory, we point out some features and consequences of such a program.
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© The Author(s), under exclusive licence to EDP Sciences, Springer-Verlag GmbH Germany, part of Springer Nature 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
