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Dark Matter and accelerated spacesq
The defining aspect of a gravitational field is the variation in the temporal portion of the metric as a body ascends or descends that field. For an object in free fall the clock registering the proper time along its path registers a shorter period between equally spaced events. The same thing occurs for an object accelerated in flat space. It seems reasonable to conclude that all accelerations exhibit the same interaction with local spacetime regardless the source of that acceleration. 
 We note that the large scale structure of the Universe consists of two elementary types of space times. The Voids, where the primary characteristic is expansion. And the bound matter structures composing the filaments whose primary characteristic is a static spacetime. That is, there is no expansion within bound structures.
 So, in essence, the two types are immiscible and do not intrude one into the other. So, lets ask what must happen to a test particle that leaves a gravitational field and enters a void. It's angular momentum decreases and it "falls" back into the gravitational field. In fact, a void must act like a barrier to matter structures in the same manner that the bank on a high speed race track allows autos to reach greater speeds without flying off the track. It's the fact that matter structures are constrained by the accelerated expansion of the Voids that gives rise to flat rotation curves and anomalous accelerations within large scale structures! 
 We only need redefine the concept of spacetime fields so that gravitational fields are a special case of spacetime field, with the expanding Voids being a second special type.
If we would have such a description, with voids described with different formulas than filaments, the natural problem would be unification - to find a way how above different looking parts can be understood as following the same equations.

But GR also gives us such a unified theory. So we are already much better than we would be if your proposal would be implemented.

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