The recent (1) “observation” by LIGO of a neutron star merger and (2) what is considered as different from it, namely, the arrival of the visible light from the merger at our location, used to be perceived as an indication that gravitational waves may have the same velocity as electromagnetic waves.

But it need not exactly be so, because even in this case we speak of our observation of the neutron star merger using the luminal velocity. Then make independent conclusions on gravitational waves. This is to be granted as a reconcilable manner of looking at gravitation in terms of luminal velocity.

In fact, the gravitational waves are themselves not being observed here directly in terms of gravitational waves or anything known previously to be of that kind in velocity. Instead, we are using the light and other electromagnetic radiation from those astronomical objects and saying that they present us with some real information about the gravitational waves.

From this it is clear that, even today, experimentally we are not sure of the velocity of gravitational propagation.

We assume it to be c because of our observation of electromagnetic propagations that carry to us news of gravitational propagation from the said objects. Hence, it need not show their velocity to be equal.

Here arises the question: At the level of the large-scale processes of the cosmos, is gravitation or electromagnetism (or any other non-gravitational or contrary-to-gravitation propagation) more influential in determining the general evolution of the structure of the cosmos?

I hold it has to be gravitation that has the final say. My arguments are indirect. I shall put them forth in the course of development of arguments in the discussion.

What I want to accentuate is this: If there are other (may be infinite number of) worlds of different content, density, etc., the velocity of what may be termed gravitation proper in each of them might also be different.

This may be the case also for non-gravitational propagations in each such worlds.

FOR MORE, CONSULT THE DISCUSSION:

https://www.researchgate.net/post/Gravitational_Coalescence_Paradox_GCP_Introduction_to_Gravitational_Coalescence_Cosmology

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