Neither an experimental physicist nor cosmologist, but another possibility is that our universe shares very slight space-time interactions with other universe(s

Neither an experimental physicist nor cosmologist, but another possibility is that our universe shares very slight space-time interactions with other universe(s) in a multiverse where its mass-energy casts negative mass "shadows" in ours. Blackholes in one creates areas of repulsion and expansion in the other. Maybe this is where the missing mass-energy is? It's there, but it's not in our universe.