To get the right answers, you have to ask the right questions.
Good question: How does general relativity work?
Better question: How does motion work?
Elementary, as in the very basic heart, physics involves answering this question. It's odd that physicists don't seem to be interested in asking it, much less answering it. Eh, that's what a university indoctrination will get you these days, I guess. I blame the Copenhagen interpretation and Bell's straw man inequality.
Everything comes down to basic principles. Complexity arises from the interactions of very simple laws. There are no infinities (∞). There are no singularities (1/∞). There are no contradictions.
1) There is no such thing as negative energy.
2) At every point, total energy is a constant (plus or minus a tiny uncertainty).
3) Spacetime is a field of potential energy which governs motion.
4) Space time is smooth and contiguous.
5) Waves, consisting of a wavelength (space), frequency (time) and amplitude (energy), are discrete.
Each of these three propositions is observably true. Negative energy is a phantasm. The Schwarzschild radius of a black hole proves there is such a thing as maximal energy density. (Plus the fact that the entire energy content of a black hole can be [and is] contained in its shell.) Gravity and general relativity prove that spacetime governs motion, with a special nod to the equivalence principle. For waves to be discrete, which they observably are, and for motion to exist as we know it (duh), spacetime must be smooth and contiguous. Again, there are no singularities, there are no infinities, there are no contradictions.
A reminder to physicists: The map is not the territory. The math, no matter how elegant, is not the reality. It is, at best, a description of reality. A probability wave does not describe reality, but our perception of reality. Physics has made no major advances since you have collectively forgotten this simple truth. Oh, and the universe does not operate by complex laws, but by the interactions of very simple ones.
The implications of my 5 rules/laws/principles are profound.
- Black holes are not singularities, but hollow shells of maximal energy density.
- The interior of a black hole is a domain of zero energy nothingness.
- Inertial motion is a standing wave in spacetime. Crossing this wave is the cause of many relativistic effects (losing/gaining energy).
- Just as no physical thing can reach the speed of light (the propagation rate of spacetime), no physical thing can hold perfectly still.
- There exist both a minimal and maximal usable energies. (The absolute minimum being, of course, zero. Heisenberg rules!)
- There exist both a lowest and highest possible frequency/wavelength.
- By corollary (multiplication, really), there exists a lowest and highest possible amplitude for each frequency/wavelength.
- This solves the general relativity/quantum mechanics problem.
- There are no infinities.
- There are no singularities.
- There are no contradictions.