How Do Gravitational Waves Propagate?

Don't know. Have a few tidbits that may be interesting to the forum.

The gravity 'field' that the wave propagates in is created by all of the matter distributed in the universe. It is a 3 [4?] dimensional field.

If a large change in density over a pre-defined area occurs rapidly it will create a disturbance that will be felt at every point in the gravity field.

This disturbance will be felt relative to any local gravity field levels in the universe.

The magnitude of the disturbance will reduce dramatically with distance from the disturbance.

The speed of gravity and the speed of propagation of gravity must be different.

The speed of gravity has been calculated to be no slower than C^2. The C^2 comes from the error term. There have been many attempts to quantify the speed of gravity, I cite the results of one.

Very interesting.

The medium is the observer itself which will experience the changes in gravitational field on a very large scale in space. I wonder if there is some kind of interference observed.

The gravitational waves that originated during inflation are still resonating throughout the Universe. But they are probably now too feeble to measure directly. Instead, scientists look for the imprint the waves have left in the broth of elementary particles that pervaded the Universe around 380,000 years after the Big Bang, which we see via the 'cosmic microwave background'. Observations of the microwave background radiation are made using telescopes that detect radio waves, and so the 'ripples' in the background caused by gravitational waves could only be detected by a radiotelescope.

I saw a talk by Roger Penrose on how he got a team to investigate if they saw ripples in the CMB and I don't think they were successful but I don't know if that's changed.

Gravitational waves:

Gravitational waves are ripples in the curvature of space time that propagate as waves, generated in certain gravitational interactions and travelling outward from their source.

The below link says about Propagation of Gravitational Waves :

http://elmer.caltech.edu/ph237/week6/KipNewWindow5.pdf