# Searching for quantum black hole structure with the Event Horizon Telescope

## TL;DR

This paper explores how Event Horizon Telescope observations can test quantum black hole models, focusing on potential observable variability signatures and their implications for reconciling quantum mechanics with black hole physics.

## Contribution

It proposes specific observational signatures of quantum black hole structures that could be detected by EHT, bridging quantum theory and astrophysical observations.

## Key findings

- No variability observed in initial data, consistent with some quantum models
- Proposes observational strategies to detect quantum black hole signatures
- Outlines theoretical frameworks for quantum black hole structures

## Abstract

The impressive images from the Event Horizon Telescope sharpen the conflict between our observations of gravitational phenomena and the principles of quantum mechanics. Two related scenarios for reconciling quantum mechanics with the existence of black hole-like objects, with "minimal" departure from general relativity and local quantum field theory, have been explored; one of these could produce signatures visible to EHT observations. A specific target is temporal variability of images, with a characteristic time scale determined by the classical black hole radius. The absence of evidence for such variability in the initial observational span of seven days is not expected to strongly constrain such variability. Theoretical and observational next steps towards investigating such scenarios are outlined.