The multi-mode acoustic gravitational wave experiment (MAGE) is a high-frequency gravitational wave detection experiment featuring cryogenic quartz bulk acoustic wave resonators operating as sensitive strain antennas in the MHz regime. After 61 days of non-continuous data collection, we present bounds on the observable merger rate density of primordial black hole binary systems of chirp mass 1.2×10−4M⊙<M<1.7×10−9M⊙. The maximum achieved limit on the merger rate density is R>1.3×1018kpc−3yr−1 which corresponds to constraining yearly mergers to a distance of reach on the order of the solar system, or 1.0×10−6 kpc during the observational period. In addition, we exclude significantly rare and strong events similar to those observed in previous predecessor experiments as non-gravitational background signals, utilising coincident analysis between multiple detectors.
@article{arxiv.2506.03609,
title = {Experimental Limits on Planetary Mass Primordial Black Hole Mergers},
author = {William M. Campbell and Leonardo Mariani and Michael E. Tobar and Maxim Goryachev},
journal= {arXiv preprint arXiv:2506.03609},
year = {2026}
}