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Assuming there are many EQUALLY massed objects in a localised region of space:
Q1. Does the speed of any gravity wave vary with the topology, given that there are now many variations in metric values within the [composite] field?
Q2. Is there a distortion in the propagation because of the composite field?
Yes, I realise the discussion has come full-circle, but if a photon must follow a geodesic derived from a composition of many fields, then any single gravity wave must also be distorted otherwise its propagation would be more direct than the light's geodesic (which is actually the straightest path anyway).
If gravity waves always propagate at c, and if the masses within our composite field are all equal to each-other, then all waves properties must be equal also (shape etc). So we should have interference patterns appearing (exaggerated metric values) in the composite field...these regions of interference should hold either a reduction in the expression of curvature, or a hightened expression of curvature...the same as we see in all other types of fields. If we do not see this, then metric values hold no relation to the physical reality we observe only a mathematical 'similarity'. We could just as easily say the light mediates the gravitational field for itself, creating its own geodesic path based upon other sources of light.
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