The inner life
Many-Worlds Interpretation
Direct answer
Many-Worlds Interpretation: The many-worlds interpretation is Hugh Everett's proposal of 1957 that the wave function never collapses, so every possible result of a quantum event occurs, each in a separate branch of reality.
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At a glance
- Also called
- many worlds interpretation, many-worlds theory, everett interpretation, parallel universes quantum
- Found in
- Consciousness & Spiritual Psychology
- Related
- Schrödinger's Cat, Wave Function, Copenhagen Interpretation, Quantum Superposition
The many-worlds interpretation is Hugh Everett's proposal of 1957 that the wave function never collapses, so every possible result of a quantum event occurs, each in a separate branch of reality.
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What is the many-worlds interpretation?
Everett took the equations of quantum mechanics at face value. If an atom is in a superposition and an instrument measures it, the instrument joins the superposition, and so does the person who reads it. There is then one version of the observer for each outcome, and each sees a single definite result. Nothing collapses; the world is described as dividing into branches that no longer affect one another.
The proposal removes the special role of measurement at the price of an immense number of unseen branches. It makes the same predictions as other readings in every experiment yet done, so the choice between them is not settled by observation. The theory offers no way to visit, signal or choose a branch, and it lends nothing to the claim that a person can shift into a preferred timeline.
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What sets Many-Worlds Interpretation apart
Its economy is its signature: it adds nothing to the mathematics. Other readings attach a collapse rule or hidden variables to the Schrödinger equation; Everett deletes the collapse and lets the equation run. The branching is not triggered by people or by decisions. It follows from any interaction that amplifies a quantum difference to large scale, in a star as much as in a laboratory. Its standing difficulty is probability: if every outcome occurs, it must be explained what it means to say one of them was ninety per cent likely.
- Proposed by: Hugh Everett III, Princeton thesis under John Wheeler, 1957
- Everett's own title: the relative state formulation of quantum mechanics
- Named many-worlds by: Bryce DeWitt, about 1970
- Supporting theory: decoherence, which explains why branches do not interfere
- Open problem: the meaning of probability when all outcomes occur
Often mistaken for something else: Pilot-wave theory, from de Broglie and Bohm, keeps one world and adds definite particle positions guided by the wave; many-worlds adds nothing and keeps every branch.
The story behind Many-Worlds Interpretation
Everett set it out in his Princeton doctoral thesis under John Wheeler, published in 1957 as a relative state formulation of quantum mechanics. It was little noticed, and he left physics for defence research. Bryce DeWitt revived it around 1970 and gave it the name many-worlds. The study of decoherence in the 1970s and 1980s explained why branches would not interfere, and the view has since gained a substantial following among physicists.
Why Many-Worlds Interpretation matters
Many-Worlds Interpretation is the physical idea most often borrowed for talk of parallel lives and timeline shifting, which it does not support.
How to read Many-Worlds Interpretation
Physicists and philosophers work with it as one candidate answer to the measurement problem, especially in the theory of quantum computing.
Many-Worlds Interpretation in practice: an example
A reader told to jump to the timeline where the wish came true can note that in Everett's theory no branch can be reached from another.
Where readings of Many-Worlds Interpretation go wrong
Many-Worlds Interpretation is an untested interpretation, not an established fact, and its branches, if real, are beyond any contact or choice.
Sources and editorial method
This entry summarizes the tradition in the Almanac's own words; where no source is listed, it is an editorial summary rather than a primary text, and symbolic readings are named as the tradition's, not as fact.
- Source
- The Great Almanac Dictionary
- Category
- Consciousness & Spiritual Psychology
- Aliases
- many worlds interpretation, many-worlds theory, everett interpretation, parallel universes quantum, relative state formulation
- Last updated
- 2026-09-26
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Common questions
What is the many-worlds interpretation?
It is the view that the wave function describes all of reality and never collapses. Each quantum event with several possible results leads to several branches, and every result happens in one of them.
Is the many-worlds interpretation proven?
No. It agrees with all existing experiments, but so do its rivals, because they share the same mathematics for anything measurable. Which is right, if any, remains an open question.
Can you travel between the many worlds?
Not according to the theory. Once branches have separated they no longer influence one another in any detectable way, so there is nothing to carry a person or a message across.
