|
|
Many-worlds interpretation
|
The quantum-mechanical "Schrödinger's cat" paradox according to the many-worlds interpretation. In this interpretation every event is a branch point; the cat is both alive and dead, even before the box is opened, but the "alive" and "dead" cats are in different branches of the universe, both of which are equally real, but which cannot interact with each other.
The many-worlds interpretation is an interpretation of quantum mechanics that asserts the objective reality of the universal wavefunction, but denies the actuality of wavefunction collapse. Many-worlds implies that all possible alternative histories and futures are real, each representing an actual "world" (or "universe"). It is also referred to as MWI, the relative state formulation, the Everett interpretation, the theory of the universal wavefunction, many-universes interpretation, or just many-worlds.The original relative state formulation is due to Hugh Everett in 1957. Later, this formulation was popularized and renamed many-worlds by Bryce Seligman DeWitt in the 1960s and 1970s. The decoherence approaches to interpreting quantum theory have been further explored and developed, becoming quite popular. MWI is one of many multiverse hypotheses in physics and philosophy. It is currently considered a mainstream interpretation along with the other decoherence interpretations and the Copenhagen interpretation.Prior to many-worlds, reality had always been viewed as a single unfolding history. Many-worlds, however, views reality as a many-branched tree, wherein every possible quantum outcome is realised. Many-worlds claims to reconcile the observation of non-deterministic events, such as the random radioactive decay, with the fully deterministic equations of quantum physics. In many-worlds, the subjective appearance of wavefunction collapse is explained by the mechanism of quantum decoherence, which resolves all of the correlation paradoxes of quantum theory, such as the EPR paradox and Schrödinger's cat, since every possible outcome of every event defines or exists in its own "history" or "world". In lay terms, there is a very large—perhaps infinite—number of universes, and everything that could possibly have happened in our past, but did not, has occurred in the past of some other universe or universes.
Quantum mechanics
Introduction
Glossary · History
Bra-ket notation · Classical mechanics
Hamiltonian · Interference
Old quantum theory
Complementarity · Decoherence
Duality · Ehrenfest theorem
Entanglement · Exclusion
Measurement · Probability amplitude
Nonlocality · Quantum state
Superposition · Tunnelling
Uncertainty · Wave function
Bell's inequality · Davisson–Germer
Delayed choice quantum eraser
Double-slit · Elitzur–Vaidman
Popper · Quantum eraser
Schrödinger's cat · Stern–Gerlach
Wheeler's delayed choice
Formulations
Heisenberg · Interaction
Matrix mechanics · Schrödinger
Sum over histories
Dirac · Klein–Gordon
Pauli · Rydberg
Schrödinger
Interpretations (overview)
Consciousness-caused
Consistent histories
Copenhagen · de Broglie–Bohm
Ensemble · Hidden variables
Many-worlds · Objective collapse
Pondicherry · Quantum logic
Relational · Stochastic
Transactional
Quantum chaos · Quantum field theory
Quantum information science
Scattering theory
Bell · Bohm · Bohr · Born · Bose
de Broglie · Dirac · Ehrenfest
Everett · Feynman · Heisenberg
Jordan · Kramers · von Neumann
Pauli · Planck · Schrödinger
Sommerfeld · Wien · Wigner
v
d
e
Cite error: There are tags on this page, but the references will not show without a {{Reflist}} template or a tag; see the help page.
|
|
Created By:
System
|
|
|
|
|