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If you're talking about Newtons shells its 'gravity' equals out in all directions except towards its center which, if so, should present us with a gravitational direction in a 'free fall geodesic' it seems? What Newtons shells assume is that you always will find a center, to the middle of a sphere, wherefrom you can define the gravity to 'emanate' from, as I understands it? So that should be testable if so.==Hmm, At least I think that is what it assumes Been some time since I thought of that one..Yep, I think I got it right "Combining the two results, we see that, at a point inside a symmetric distribution of mass, only the mass closer to the centre contributes to the gravitational field."From Newtons shells.
...could you not posit a region in which the vacuum energy exists and another in which it doesn't?
If space doesn't exist then you have no problems with uncertainty principle requiring fluctuations in vacuum and causing a background energy.
And like the Casimir effect, would this not create a zone of negative pressure (for want of a better phrase).
My favourite concept of dark energy is neither a push or a pull, but rather a change in background - if you and your friend were standing on a paved floor and each stone increased in size by 10% (or an extra stone was added for every 10 - same thing) - would you be pushed apart or pulled apart, or just notice that the distance has increased without feeling a particular force.
If you post you post the model expect some criticism and mad questions, and if it has no maths I am afraid it is difficult to take too seriously; heuristic solutions are nice but don't really add much unless the maths can be easily added