Quantum Hotspots: Mean Fields, Open EFTs, Nonlocality and Decoherence Near Black Holes

TL;DR

This paper compares open effective field theories and mean-field methods in a solvable black hole model to understand nonlocality, decoherence, and thermalization near horizons, highlighting their validity and differences.

Contribution

It evaluates the applicability of open EFT and mean-field approximations to black hole models, revealing their domains of validity and relation to perturbative approaches.

Findings

Mean-field methods can produce nonlocal Hamiltonians.

Open EFTs effectively describe late-time decoherence and thermalization.

Both methods have distinct regimes of validity in black hole modeling.

Abstract

Effective theories describing black hole exteriors resemble open quantum systems inasmuch as many unmeasurable degrees of freedom beyond the horizon interact with those we can see. A solvable Caldeira-Leggett type model of a quantum field that mixes with many unmeasured thermal degrees of freedom on a shared surface was proposed in arXiv:2106.09854 to provide a benchmark against which more complete black hole calculations might be compared. We here use this model to test two types of field-theoretic approximation schemes that also lend themselves to describing black hole behaviour: Open EFT techniques (as applied to the fields themselves, rather than Unruh-DeWitt detectors) and mean-field methods. Mean-field methods are of interest because the effective Hamiltonians to which they lead can be nonlocal; a possible source for the nonlocality that is sometimes entertained as being possible for black holes in the near-horizon regime. Open EFTs compute the evolution of the field state, allowing discussion of thermalization and decoherence even when these occur at such late times that perturbative methods fail (as they often do). Applying both of these methods to a solvable system identifies their domains of validity and shows how their predictions relate to more garden-variety perturbative tools.