The Stress Tensor assumes the mass to be continuous and together.
Moment we bring space between, the Stress Tensor is not valid. Where is the pressure? Where is the shear Stress? Where is the momentum density? In a continuum of matter, these things make sense.
But most of the space we cover in Stars, Planets, Moons, Galaxies, and Inter Galactic levels, we do not have the continuum of mass but have vast space in between which we do not understand.
That sounds interesting, and though I'm not a GR expert, it seems to me that there is a practical problem here. If you try to calculate the G field from some estimated SE tensor, surely you don't get a realistic answer. On the other hand if you use the known G field you might using numerical relativity recalculate recursively until you get a SE tensor that works. But what have you done? Used GR to calculate the G field or use GR to calculate the SE tensor? Surely Einstein's original intention was to use the SE tensor to calculate a G field? Or am I mistaken?
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