A What is the origin of the Dipole Repeller and similar structures?

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how can lower density cosmic structures occur?
I can see how slight unevenness in density of the early universe could result in matter grouping due to gravity however I would think that this would lead to more focal regions of higher density and more disperse regions of lower density. I can't visualise a mechanism that would support development of focal regions of lower density.
 
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brianmck said:
focal regions of lower density.
What makes you think such regions exist in our universe?
 

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