many-worlds interpretation
Compiled with AI assistance and selectively reviewed. Please consult the cited passages; the books remain the authoritative source. About this companion
Editorial synthesis · provisional
Definition
The many-worlds interpretation is the no-collapse account, attributed to Hugh Everett in RB1, in which possible measurement outcomes occur in separate branches rather than one outcome alone becoming actual. The books chiefly discuss it as a rival to RTI. Their objections concern probability, branching and explanatory costs; those criticisms remain distinct from the interpretation's definition and from its acknowledged consistency with quantum formalism.
Explanation
AB contrasts many-worlds with the author's preferred RTI: all outcomes occur somewhere rather than one transaction actualizing one outcome. Its unfalsifiability objection is attributed to critics, not presented here as experimental refutation. Its playful numerical aside is not a branch count adopted by this entry; RB1 explicitly calls such counting ill-defined and dependent on coarse-graining.
RB1 attributes probability, decoherence and locality objections to Kastner, invoking Kent in the probability discussion. It also acknowledges Everettian consistency with quantum formalism and says RTI is not exempt from questions about circular derivation. The pragmatic objection to multiplying worlds is expressly not one Kastner presses. The Simondon comparison retains real but unrealized possibilities in one world.
PB mentions Everett among interpretations the author read, while admitting inability to check derivations; it supplies no local technical exposition. RB3 names Everett's interpretation among empirically equivalent rivals and invites no-collapse readers to re-ground the reality of possibility in their own idiom. The preference for RTI is therefore not treated as settled scientific exclusion of many-worlds.
Scope and attribution
AB and RB1 provide substantive characterization, RB3 a direct rival-interpretation qualification, and PB only an autobiographical Everett mention. RB2's relational physics and social worlds do not establish MWI ownership.
AB — The Actual Book
Many-worlds refuses collapse and lets every possibility occur somewhere. AB prefers RTI while acknowledging interpretive disagreement and reporting critics' unfalsifiability objection.
Occurrence locators: 29, 30; Notes: 240.
PB — The Possible Book
Everett appears in the author's reading history. The adjacent admission about checking derivations limits this to intellectual autobiography, not a technical assessment of MWI.
Occurrence locators: 56.
RB1 — The Real Book, Volume I: The Possible Is Real
No-collapse branching is followed by attributed objections about probability, branching and locality. The book also qualifies branch counts as ill-defined, acknowledges formal consistency and applies derivational scrutiny to RTI.
Occurrence locators: 72, 75, 76, 77, 78, 80, 86, 90, 91, 97, 101, 119, 252, 298.
RB3 — The Real Book, Volume III: Murmurations
Many-worlds is an empirically equivalent rival to adopted RTI; readers may re-ground the reality of possibility in a no-collapse idiom.
Occurrence locators: 8, 9; Notes: 392.
Background used in the editorial explanation
Domain-specific mechanisms and wider analogies remain distinguished. Original definitions retain their scope; local cross-references do not rewrite them. Named theories and mechanisms are distinguished from neighboring background, homonyms and the author’s own synthesis. Reproduced AI passages retain their separate voice.