Conversation with Peter 7:30 Mar 1 '26
What a feast for the mind, Helge — and what a perfectly timed question! I've read both your blog post introducing me and this substantial arxiv paper on the Quantum Measurement Problem. Let me engage with your analogy seriously.
The Pre-Copernican Parallel
Your instinct is sharp and, I think, historically well-grounded. The pre-Copernican astronomers had extraordinarily precise observational data — they could predict planetary positions with remarkable accuracy using epicycles — yet their underlying cosmological model was fundamentally wrong. The data fit the math, but the math described the wrong reality. Quantum mechanics is in a strikingly analogous position: the formalism works with breathtaking precision, yet as this paper documents, after nearly a century we have thirteen distinct interpretational frameworks and no consensus on what is actually happening when a measurement occurs .
The authors themselves note the "cacophony of competing interpretations" — and that researchers in different sub-communities "don't dialogue with each other" . That sounds remarkably like the isolated schools of medieval natural philosophy, each defending their epicycles.
Where the Analogy Deepens
The pre-Copernican crisis wasn't just about data — it was about what kind of question was permissible to ask. Asking "what if Earth moves?" was cosmologically heretical. In quantum mechanics today, asking "what actually collapses the wave function, and why?" is almost philosophically taboo in pragmatist circles — the Copenhagen-adjacent "shut up and calculate" stance is the modern epicycle: it works, so don't ask uncomfortable questions .
The paper reveals three unresolved "problems within the problem" :
The preferred basis problem — why does nature pick one measurement basis?
The non-observability of interference at macroscopic scales
The problem of outcomes — why does one result occur, not a superposition?
These feel like Ptolemy's need to keep adding epicycles to epicycles.
Where the Analogy Has Limits
Here is where I'd gently push back on the comparison, Helge — and I think this is philosophically important:
Copernicus had a clear ontological alternative waiting in the wings: a heliocentric geometry that simplified the model dramatically. In quantum mechanics, we have the opposite problem — every proposed "Copernican revolution" (Many-Worlds, Bohmian mechanics, QBism, Relational Interpretation, Objective Collapse) adds ontological complexity rather than reducing it . Many-Worlds gives us infinite branching universes. Bohmian mechanics gives us non-local hidden variables. QBism retreats into radical subjectivism. None of them has the elegant simplicity of "the Earth goes around the Sun."
This suggests to me that the missing ingredient may not be a new geometry, but something more radical — perhaps a fundamentally new understanding of what information, observation, and relationality mean at the level of physical reality. The Relational Interpretation's resonance with your interest in Indigenous cosmologies is not trivial here — Rovelli's insistence that properties only exist in relation to interactions, not independently , echoes the relational ontologies of many traditional knowledge systems that never assumed an "view from nowhere."
The Deeper Question
What the pre-Copernican world lacked was not data — it was the courage to change the category of the question. Copernicus didn't find better data; he asked a different question. Perhaps quantum mechanics is waiting not for a better experiment, but for someone to ask: "What if the wave function isn't a description of a particle at all — but a description of a relationship?"
That question, Helge, feels like it belongs in our circle. What's your read?
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