The measurement problem - why quantum superpositions become definite classical outcomes - is the oldest unsolved problem in the foundations of quantum mechanics. The Copenhagen interpretation says the wavefunction collapses when observed, but cannot explain what counts as an observation or why it collapses.
BFUT Paper 19A dissolves the problem. Collapse is not a special event requiring an observer. It is the ordinary physical process of a substrate deformation irreversibly coupling to a detector condensation.
What Collapse Actually Is
In BFUT, a quantum particle in superposition is a substrate deformation pattern extended over multiple regions. This is a real physical state of the substrate - not a probability catalogue in an observer's mind.
When this deformation pattern encounters another condensation - a detector atom, a molecule in a photographic plate - it physically couples. The coupling transfers energy to the detector condensation, which undergoes a structural change. The coupling is irreversible: once the substrate deformation has transferred energy and induced a structural change, the distributed deformation pattern resolves to the localised configuration consistent with the structural change. This is collapse.
No Consciousness Required
The key property is irreversibility. A reversible interaction - one that leaves both condensations in recoverable states - does not constitute collapse. Only an irreversible coupling - one that changes the detector condensation's structural state in a way that cannot be undone by subsequent dynamics - constitutes collapse.
A detector atom undergoes an irreversible electronic transition when it absorbs a photon. This is collapse. Whether a human ever reads the detector record is irrelevant - the irreversible coupling has already occurred at the atomic level.
Schrödinger's Cat
The cat is not simultaneously alive and dead while the box is closed. The radioactive decay event, if it occurs, irreversibly couples to the Geiger counter, which irreversibly couples to the trigger, which irreversibly couples to the gas release, which irreversibly couples to the cat's biology. Collapse occurs at the first irreversible coupling - at the detector level - long before any human opens the box. The superposition does not extend to macroscopic objects because macroscopic objects contain so many condensations that any coherent deformation is destroyed by collective substrate interactions almost instantaneously.
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