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False. Space is not filled with dark matter. Dark matter is very "clumpy". For example, so far we have found no evidence of dark matter in our own solar system and light travels just fine in our solar system.
Your description sounds a bit like the old Steady State theory that had continuous creation of (ordinary) matter in conjunction with the expanding universe.
Since the discovery of the cosmic microwave background radiation 50 years ago, that theory is no longer viable.
We have strong evidence from various experiments that all of the matter (ordinary and dark) was created during the first few minutes. (Some fraction has transmuted via thermonuclear fusion to other elements heavier than hydrogen and helium). The ratio of dark matter to ordinary matter was fixed by that time.
An aside - dark energy does not transform into dark matter and could not have done so. We know this since dark energy is indeed created along with new space as the universe expands. When the universe was very young, and much smaller, the dark matter totally dominated the mass-energy content. Today, there is over twice as much energy in the dark energy as there is in the dark matter (rest mass x c^2).
Some aspect of the old Steady State model ironically lives on in terms of the creation of new energy (not mass).
The assumption of a spatial plenum of luminiferous aether, rather than a spatial vacuum, provided the theoretical medium that was required by wave theories of light.
The concept was the topic of considerable debate throughout its history, as it required the existence of an invisible and infinite material with no interaction with physical objects.
The ether was supposed to provide the medium for light transmission, but wouldn't have interacted gravitationally. This ether would have to just pass photons along unaffected
Hypothetical and hidden
Now, Hooman Davoudiasl of Brookhaven National Laboratory and colleagues at TRIUMF and the University of British Columbia have proposed a new particle dubbed X that could solve both of these mysteries. X has a mass of about 1000 GeV – making it about a thousand times heavier than a proton. This particle can decay to a neutron or to two hypothetical hidden particles called Y and Φ. Both hidden particles would have masses of about 2–3 GeV. Its antiparticle, anti-X, decays to an antineutron or to the pair anti-Y and anti-Φ.
Physicists have tried to try to explain the baryon asymmetry by invoking a violation of the charge–parity (CP) symmetry – the result being that decaying particles are more likely to generate matter than antimatter. CP violation has been observed in laboratories, but the preference for matter is far too small to account for the proportion of matter in the universe.
X also commits CP violation in a way that author Kris Sigurdson of the University of British Columbia calls a "yin yang" decay pattern. While X decays to neutrons more often than anti-X decays to antineutrons, it is balanced by anti-X, which decays to anti-Y and anti-Φ more often than Y and Φ. When almost all particles with an available antiparticle annihilated one another in the early universe, these discrepancies left a chunk of visible matter and a heavier chunk of dark antimatter to form the cosmos.
However Michelson and Morley did an experiment in 1887 that pretty much showed that there was no ether, and that light therefore could be understood as not requiring a medium. this understanding has been borne out by many other experiments that are consistent with an absence of the ether.
here are some cool pages that explain the essentials of the michelson-morley experiment: