Repulsive effect of covariant effective quantum gravity
Phys. Rev. D 112, 124042 – Published 11 December, 2025
DOI: https://doi.org/10.1103/77sk-dmd9
Abstract
In general relativity, gravity around a black hole is universally regarded as an attractive force. However, quantum effects may significantly alter this classical picture and thus affect the dynamics of test particles. In this work, we investigate geodesic motion in a recently proposed covariant effective quantum black hole model, the ZLMY type I model in [Black holes and covariance in effective quantum gravity, Phys. Rev. D 111, L081504 (2025).]. Our analytical study reveals that, at the Planck scale, gravity can exhibit a repulsive character, most notably in trajectories involving turning points. These findings suggest that quantum corrections could fundamentally modify our conventional understanding of gravitational interactions in certain regimes.
