A new preprint on arXiv outlines a concept called GravNet, a global network of detectors aimed at finding gravitational waves in the challenging MHz to GHz frequency range. According to the paper (https://arxiv.org/abs/2603.24645), these high-frequency waves could come from important cosmic events tied to major questions in cosmology. The proposed methodology relies on running multiple cavities in strong magnetic fields at distant geographic locations, taking synchronous measurements, and then analyzing correlations across the sites to separate real signals from local noise. The authors note this is still a conceptual design; they have only completed a first demonstration experiment using a non-superconducting cavity to test data-analysis approaches. As a preprint, the work has not yet undergone peer review, and no gravitational-wave detections have been made. Limitations include the early stage of the technology and the challenge of scaling up to a full global network.