double-slit experiment
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 double-slit experiment sends light or particles through two narrow openings toward a screen, producing interference bands when the alternatives remain undistinguished; determining which slit is taken removes the interference. AB and PB read the bands as marks of real unrealized possibilities, while RB1 also presents a transactional interpretation. Those readings are distinguished from the experimental pattern itself.
Explanation
AB introduces the screen's bright and dark bands as a challenge to a world composed only of actual things. Its later account explicitly identifies the reality of unrealized possibilities as the author's interpretation, even while emphasizing the experimental behavior. PB condenses that reading into the two-slit figure: alternatives that never became actual nevertheless leave their fingerprint in the pattern.
RB1 first presents the experiment under wave–particle duality, then revisits it through RTI. In that account, an offer wave reaches each potential absorber through both slits; its combined amplitude weights an incipient transaction. A which-slit detector becomes an absorber and destroys interference. The adjacent delayed-choice discussion attributes to Kastner the claim that nothing travels backward in observable time. The transactional explanation therefore remains an attributed interpretation, not evidence that the experiment uniquely establishes RTI or the author's wider ontology.
Scope and attribution
AB, PB and RB1 own the reviewed treatments. RB2 and RB3 receive no double-slit treatment from this bounded review. The physical arrangement, authorial possibility reading and RTI account remain distinct.
AB — The Actual Book
The experiment introduces the claim that unrealized possibilities shape actual outcomes. AB explicitly owns that reading and acknowledges the lack of consensus among quantum interpretations.
Occurrence locators: 19, 25; Notes: 235.
PB — The Possible Book
The Tractatus's two-slit figure treats bright and dark bands as traces of possibilities that never became actual, within its account of actuality as a resolution of the possible.
Occurrence locators: 90.
RB1 — The Real Book, Volume I: The Possible Is Real
The experiment first illustrates wave–particle duality and later illustrates RTI's offer/confirmation account. The which-slit detector is an absorber in that reading; the surrounding discussion denies observable backward-time travel.
Occurrence locators: 45, 68.
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.