The Everett Interpretation of Quantum Mechanics: Many Worlds or None?

Noûs ◽  
1984 ◽  
Vol 18 (4) ◽  
pp. 635 ◽  
Author(s):  
Howard Stein
Keyword(s):  
Quantum Mechanics ◽  
Interpretation Of Quantum Mechanics ◽  
Many Worlds ◽  
Everett Interpretation

scholarly journals Branch-counting in the Everett interpretation of quantum mechanics

2021 ◽  
Vol 477 (2255) ◽  
Author(s):  
Simon Saunders
Keyword(s):  
Quantum Mechanics ◽  
Ad Hoc ◽  
Quantum Probability ◽  
Objective Probability ◽  
Theory Approach ◽  
Interpretation Of Quantum Mechanics ◽  
Many Worlds ◽  
Everett Interpretation ◽  
Counting Rule ◽  
Bose Einstein

A defence is offered of a version of the branch-counting rule in the Everett interpretation (otherwise known as many worlds interpretation) of quantum mechanics that both depends on the state and is continuous in the norm topology on Hilbert space. The well-known branch-counting rule, for realistic models of measurements, in which branches are defined by decoherence theory, fails this test. The new rule hinges on the use of decoherence theory in defining branching structure, and specifically decoherent histories theory. On this basis ratios of branch numbers are defined, free of any convention. They agree with the Born rule and deliver a notion of objective probability similar to naive frequentism, save that the frequencies of outcomes are not confined to a single world at different times, but spread over worlds at a single time. Nor is it ad hoc : it is recognizably akin to the combinatorial approach to thermodynamic probability, as introduced by Boltzmann in 1879. It is identical to the procedure followed by Planck, Bose, Einstein and Dirac in defining the equilibrium distribution of the Bose–Einstein gas. It also connects in a simple way with the decision-theory approach to quantum probability.

scholarly journals Muitos mundos e a interpretação ondulatória: revendo a conexão à luz da filosofia Schorödingeriana

2016 ◽  
Vol 19 (3) ◽  
pp. 343
Author(s):  
Caroline Elisa Murr
Keyword(s):  
Quantum Mechanics ◽  
Interpretation Of Quantum Mechanics ◽  
Many Worlds ◽  
Many Worlds Interpretation ◽  
Single World

http://dx.doi.org/10.5007/1808-1711.2015v19n3p343This paper presents Erwin Schrödinger’s Wave Interpretation of Quantum Mechanics, with the main goal of comparing it to the so called Many Worlds Interpretation, of which Bryce DeWitt is the most important figure. It is commonly said that DeWitt’s and Everett’s Interpretations are equivalent, and both would have been inspired by Schrödinger’s wave-like approach. This paper claims those stances to be superficial, requiring a more detailed exam of the philosophical grounds held by the authors, besides other distinguishing details. A connexion may be established concerning the rejection of the quantum collapse, although one should be careful about the meaning of the term in each standpoint. This article also shows the balance of Schrödinger’s Interpretation of Quantum Mechanics in regard to his philosophy in a wider sense. Finally, it concludes that detaching Schrödinger’s interpretation from Many Worlds is more coherent with his philosophical assumptions; he conceives a single world containing infinite possibilities.

scholarly journals A Phenomenological Reading of the Many-Worlds Interpretation of Quantum Mechanics

2020 ◽  
Author(s):  
Joaquin Trujillo
Keyword(s):  
Wave Function ◽  
Quantum Mechanics ◽  
Measurement Problem ◽  
Copenhagen Interpretation ◽  
Interpretation Of Quantum Mechanics ◽  
Many Worlds ◽  
Standard Interpretation ◽  
Hermeneutic Phenomenological ◽  
Many Worlds Interpretation ◽  
The Many

The articles provides a phenomenological reading of the Many-Worlds Interpretation (MWI) of quantum mechanics and its answer to the measurement problem, or the question of “why only one of a wave function’s probable values is observed when the system is measured.” Transcendental-phenomenological and hermeneutic-phenomenological approaches are employed. The project comprises four parts. Parts one and two review MWI and the standard (Copenhagen) interpretation of quantum mechanics. Part three reviews the phenomenologies. Part four deconstructs the hermeneutics of MWI. It agrees with the confidence the theory derives from its (1) unforgiving appropriation of the Schrödinger equation and (2) association of branching universes with the evolution of the wave function insofar as that understanding comes from the formalism itself. Part four also reveals the hermeneutical shortcomings of the standard interpretation.

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