I’ve seen articles about a scientist who endeavors to build such a device, and got funding to try building stuff with the goal of communications. I tracked down the underlying paper: arXiv:gr-qc/0702100v2 25 Feb 2007 «“Millikan oil drops” as quantum transducers between electromagnetic and gravitational radiation».

The paper is quite readable. You could simply have his idea be true in your universe, and use it as the bases of gravity radio.

Pairs of Planck-mass-scale drops of superuid helium coated by electrons (i.e., “Millikan oil drops”), when levitated in the presence of strong magnetic elds and at low temperatures, can be efficient quantum transducers between electromagnetic (EM) and gravitational (GR) radiation. A Hertz-like experiment, in which EM waves are converted at the source into GR waves, and then back-converted at the receiver from GR waves back into EM waves, should be practical to perform. This would open up observations of the gravity-wave analog of the Cosmic Microwave Background from the extremely early Big Bang, and also communications directly through the interior of the Earth.

The basic idea is that a pair of superfluid helium drops having plank mass and given a unit charge (by having one extra electron) will radiate and receive GR and EM at equal energy.

The superfluid drop acts as a single particle and doesn’t have the freedom to flex and move within the drop itself; it acts as a perfectly rigid uniformly charged particle.

I’ve seen articles about a scientist who endeavors to build such a device, and got funding to try building stuff with the goal of communications. I tracked down the underlying paper: arXiv:gr-qc/0702100v2 25 Feb 2007 «“Millikan oil drops” as quantum transducers between electromagnetic and gravitational radiation».

The paper is quite readable. You could simply have his idea be true in your universe, and use it as the bases of gravity radio.

Pairs of Planck-mass-scale drops of superuid helium coated by electrons (i.e., “Millikan oil drops”), when levitated in the presence of strong magnetic elds and at low temperatures, can be efficient quantum transducers between electromagnetic (EM) and gravitational (GR) radiation. A Hertz-like experiment, in which EM waves are converted at the source into GR waves, and then back-converted at the receiver from GR waves back into EM waves, should be practical to perform. This would open up observations of the gravity-wave analog of the Cosmic Microwave Background from the extremely early Big Bang, and also communications directly through the interior of the Earth.

The basic idea is that a pair of superfluid helium drops having plank mass and given a unit charge (by having one extra electron) will radiate and receive GR and EM at equal energy.

The superfluid drop acts as a single particle and doesn’t have the freedom to flex and move within the drop itself; it acts as a perfectly rigid uniformly charged particle.