I wrote The Answers Were There All Along: General Relativity, the Wave Function, and the Missing Boundary of Scale because one of the most famous tensions in physics has somehow become both widely known and poorly understood. People know that General Relativity and quantum mechanics do not fit together cleanly. They know there is a problem involving gravity, measurement, and the wave function. Then the explanation usually becomes either very technical very quickly or so mystical that the actual problem disappears.
I wanted to tell the story differently. General Relativity is extraordinarily good at describing spacetime geometry. The wave function is extraordinarily good at describing quantum possibility and evolution. The entertaining part is that both descriptions have been standing in front of us for roughly a century, each working with remarkable precision, while we keep asking which one is supposed to swallow the other.
That may be the wrong drama. The conflict begins to look different when each description is given an address: not merely a position in space, but the scale enclosure in which its terms are lawful. General Relativity does not have to stop being General Relativity. Quantum evolution does not have to surrender unitarity. The missing piece may be the stated boundary and the rule for crossing it. The answers were there all along. What was missing was a place to put them.
That made for a more narrative gateway into the problem. It also created a danger. A satisfying explanation can be satisfying because it is correct, or because the person who wrote it enjoys the sound of his own machinery. I am not exempt from that distinction. If I was going to suggest that a missing boundary of scale could clarify a century-old representational conflict, I needed to do something less flattering than admire the sentence.
So I looked for an existing problem where the same approach would either become useful or become obviously unnecessary. I found one in The Apparatus Strikes Back: Momentum Conservation and the Cost of Spatial Superpositions, a recent paper by Lucas C. Celeri, Diogo O. Soares-Pinto, and Daniel A. Turolla Vanzella. Their result gives an exact baseline for the visibility cost created when an apparatus recoils in a massive spatial superposition. I did not need to replace that result. I needed to preserve it and ask what remained unresolved after recoil, ordinary decoherence, internal modes, and conservation laws had already been counted.
The remaining question
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