nucleation

THEORY-1213: In relational quantum mechanics as Di Biagio and Rovelli reformulate it, classical subsystems whose variables couple properly, so as to get correlated, come to agree, so that the merging of perspectives answers the combination problem and the facts held relative to different outside systems never conflict about the same variables

1 min read

Properties4
StatusProposed
Tagsquantum-foundations
SourceLIT-1676 — Relative Information, Relative Facts
ExtendsTHEORY-1074 — In Di Biagio and Rovelli's relational account two classical subsystems' perspectives merge, agreeing on a variable's value and on each other's, when they couple to that variable or to each other, and a coupling to a complementary variable can remove a relative fact from a perspective that did not interact; that this answers the combination problem and keeps perspectives consistent is shown only in worked examples computed relative to a single outside system

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Source

Di Biagio and Rovelli (2025), LIT-1676, arXiv 2510.11349v2, §VI (pp. 4–5); read in NOTE-1214. What the paper computes is THEORY-1074, which this entry extends.

Why it is Proposed

Every agreement the paper shows is read off one joint distribution, relative to a single outside system, where agreement follows from probability theory. “Coupling correctly” is not stated in general, and no proof is given.

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