All modern wireless communication technologies are based on electromagnetism. However, electromagnetic signals are susceptible to screening and blocking, so their availability cannot be guaranteed in adverse environments. This raises a fundamental question: Can information be transmitted through a truly unblockable channel? Here we show that gravity, unlike electromagnetism, offers such a path. We propose and implement a wireless communication protocol in which a broadcaster encodes a binary message by moving a mass, while a receiver detects the resulting gravitational signal with a gravimeter. We validate this scheme experimentally, successfully transmitting a gravitational message a distance of ≈ 0.7 m through a brick wall at a rate of 1 bit min−1. These results establish gravity as a viable platform for unblockable communication.
Cite
@article{arxiv.2511.16710,
title = {Unblockable Communication With Gravity},
author = {Andrew J. Groszek and Charles W. Woffinden and Michael D. Harvey and Andrew G. White and Matthew J. Davis},
journal= {arXiv preprint arXiv:2511.16710},
year = {2025}
}