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Metric junction
#1
Metric junctions have been studied off and on since the 1930's. As far as I know this isn't an active field of research now. But, maybe it should be. W. Israel showed how to treat an infinitely thin shell relativistically;his "thin shell" method was significant because singularities were known to raise their ugly heads if the shell was allowed any structure. But these singularities aren't just mathematical, but have physical effects because they arise in the space time maths.

In his treatment he allowed for boundary conditions that separated two equivalent spaces. But in our Universe it may be argued that we have at least two differing space times. We have the static space times within bound gravitational structures and we have the expanding space times associated with the Voids. And, thus we can conclude that we have existing metric junctions wherever gravitational structures abut Voids. In effect, everywhere!

So why don't we observe singularities at these junctions? The whole Universe is in flux,in motion. Galaxies swell and contract as they rotate;with varying mass arms presenting themselves to differing gravitational fields within cluster and supercluster formations. This motion ensures that thin shell space time boundaries between matter structures and expanding Voids never occur. 

It seems reasonable to ask " do these junctions look like gravitational fields to the rest of the universe?" It is certainly reasonable to investigate these space time junctions. When singularities cannot form does it preclude the existence of any type of potential? It seems to me that without the "pressure" applied by the expanding Voids against the static space times of bound matter structures
There would be no significant boundary structure. And thus, no dark matter.
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