"The basic idea of the Electric Universe Theory (EUT), also known as Plasma Cosmology (PC, although PC is really a subset of EUT), is that everything in the Universe is connected, mainly via electric currents flowing through plasma."
https://thehonestscientist.com/electric-universe/
"gravity waves are waves generated in a fluid medium or at the interface between two media"
https://en.wikipedia.org/wiki/Gravity_wave
Liquid spacetime: A very slippery superfluid, that's what spacetime could be like
https://phys.org/news/2014-04-liquid-spacetime-slippery-superfluid.html
"A high frequency gravitational wave generator including a gas filled shell with an outer shell surface, microwave emitters, sound generators, and acoustic vibration resonant gas-filled cavities. The outer shell surface is electrically charged and vibrated by the microwave emitters to generate a first electromagnetic field. The acoustic vibration resonant gas-filled cavities each have a cavity surface that can be electrically charged and vibrated by acoustic energy from the sound generators such that a second electromagnetic field is generated. The two acoustic vibration resonant gas-filled cavities are able to counter spin relative to each other to provide stability, and propagating gravitational field fluctuations are generated when the second electromagnetic field propagates through the first electromagnetic field."
https://patents.google.com/patent/US10322827B2/en
"Gravitational Wave Generator
Background Theory
Foamy Ether Theory describes electromagnetic waves as distortions in the foam that are transverse to the direction of propagation. When two electromagnetic waves, traveling in opposite directions meet, a compression of foamy ether (space) takes place between the waves. Screen captures of a simulation (using ThreeDimSim) of this compression is illustrated in Figure 1.
Figure1a shows the initial wave where the red wave on top is traveling from right to left and the green wave on the bottom is traveling from left to right. When the two waves are aligned, as shown in Figure 1b, a compression of foamy ether takes place momentarily (see the blue cell in the center of Figure1b). As the waves leave each other (Figure 1c), a momentary stretching of the foam occurs. This compressing and stretching is equivalent to a gravitational wave which will propagate into the surrounding space."
https://www.peterhahn.ca/gravitational-wave-generator
"Gravitational waves are produced by masses moving through space-time in a special way. The simplest system that produces gravitational waves is two masses orbiting their common center of mass.
One of the most common such system is a binary star system – two stars orbiting each other's common center of mass. It turns out that about half of the stars you see in the sky are members of a binary system. And those stars can be at any stage of their life cycle, which means you can have any combination of a normal star, giant star, white dwarf, neutron star, or black hole. Another place you might find large masses orbiting each other is the center of a galaxy - if two galaxies merged, their central supermassive black holes would orbit for a long time before they also merged."
https://imagine.gsfc.nasa.gov/science/toolbox/gwaves1.html