Light incoherence due to quantum-gravitational fluctuations of the background space

TL;DR

This paper estimates the impact of quantum-gravitational fluctuations on light incoherence and concludes that current stellar interferometry data cannot detect such effects, challenging previous claims of potential observations.

Contribution

It provides a theoretical estimate showing quantum-gravitational effects are too small to be observed with current stellar interferometry techniques.

Findings

Quantum-gravitational fluctuations do not produce detectable light incoherence.

Current stellar interferometry data cannot confirm Planck-scale quantum effects.

Theoretical estimates set bounds on observable quantum-gravitational phenomena.

Abstract

Based on the theory of mutual coherence of light from an extended incoherent quasi-monochromatic source (providing a basis of stellar interferometry) we estimate the degree of light incoherence due to quantum-gravitational fluctuations of the background metric. It is shown that the stellar interferometry observational data considered in the literature for a last few years as a manifestation against the Planck scale quantum-gravitational fluctuations of the background metric have no chance for detecting such an effect.