Spacetime is not actually formulated with the concept of matter, merely placeholders for it known as tensors.
Prof, I'm saying it would be a dynamic structure, background independent.
It is a strange realization to be had, yet it is very plain when you see it, General Relativity says nothing about matter, or what it's properties may be. It is only about the geometry of spacetime, and the ways in which the warping of spacetime describes gravity and motion.
It is then that you insert matter where the tensor locations are, and everything lines up with observation.


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