The Many-Worlds Interpretation (MWI) of quantum mechanics, first proposed by Hugh Everett in 1957, posits that all possible outcomes of a quantum measurement are realized in coexisting branches of the universe. While traditionally confined to microscopic physical systems, this article proposes that the logic of MWI offers an illuminating metaphor –and potentially a modeling framework– for understanding the increasingly fragmented landscape of contemporary geopolitics. In particular, the behavior and communication strategy of political figures such as Donald J. Trump appear to resonate with an Everettian logic: the simultaneous activation of multiple, incompatible narratives, none of which collapses under scrutiny, and each sustained within separate cognitive or media ecosystems. We argue that this “Many-Worlds political style” challenges classical models of political rationality, narrative coherence, and public truth. Drawing from recent work in quantum cognition, narrative theory, and political psychology, we explore how Everett’s interpretation may offer not only a metaphorical but a structurally meaningful way to describe the emerging post-truth political order. The article concludes with a discussion of how such cross-disciplinary frameworks may contribute to both political theory and foundational questions in quantum epistemology.
The Many-Worlds Interpretation (MWI) of quantum mechanics, first proposed by Hugh Everett in 1957, posits that all possible outcomes of a quantum measurement are realized in coexisting branches of the universe. While traditionally confined to microscopic physical systems, this article proposes that the logic of MWI offers an illuminating metaphor –and potentially a modeling framework– for understanding the increasingly fragmented landscape of contemporary geopolitics. In particular, the behavior and communication strategy of political figures such as Donald J. Trump appear to resonate with an Everettian logic: the simultaneous activation of multiple, incompatible narratives, none of which collapses under scrutiny, and each sustained within separate cognitive or media ecosystems. We argue that this “Many-Worlds political style” challenges classical models of political rationality, narrative coherence, and public truth. Drawing from recent work in quantum cognition, narrative theory, and political psychology, we explore how Everett’s interpretation may offer not only a metaphorical but a structurally meaningful way to describe the emerging post-truth political order. The article concludes with a discussion of how such cross-disciplinary frameworks may contribute to both political theory and foundational questions in quantum epistemology.
This paper explores the Many-Worlds Interpretation (MWI) of quantum mechanics as a conceptual framework for understanding fragmentation, uncertainty, and narrative divergence in global economic dynamics. We argue that the logic of Everettian branching –originally introduced to resolve the quantum measurement problem– offers a compelling metaphor for interpreting the proliferation of economic expectations, speculative bubbles, policy contradictions, and systemic crises in a multilateral, post-truth financial world. Situating our analysis within the emerging discourse of narrative economics and cognitive fragmentation, we draw parallels between physical decoherence and economic disconnection, highlighting how modern financial systems increasingly resemble a multiverse of incompatible but coexisting belief structures. We propose that modular tensor categories may eventually offer more refined topological frameworks for modeling such multiplicity. The paper con cludes by outlining ethical and policy implications for re-coherence and the role of observers in navigating global economic multiplicity.
The Many-worlds Interpretation (MWI) of quantum mechanics has captivated physicists and philosophers alike since its inception in the mid-20th century. This paper explores the historical roots, evolution, and implications of the MWI within the context of quantum theory. Beginning with an overview of early developments in quantum mechanics and the emergence of foundational interpretations, we delve into the origins of the MWI through the groundbreaking work of physicist Hugh Everett III. Everett's doctoral thesis proposed a radical solution to the measurement problem, positing the existence of multiple branching universes to account for quantum phenomenon. We trace the evolution of the MWI, examining its refinement and elaboration by subsequent physicists such as John Wheeler. Furthermore, we discuss the MWI's impact on contemporary physics, including its connections to quantum information theory and ongoing experimental tests. By providing a comprehensive analysis of the MWI's historical development and current relevance, this paper offers insights into one of the most provocative interpretations of quantum mechanics and its implications for our understanding of the universe.
This paper explores the quantum many-worlds interpretation (MWI) and its implications beyond fundamental physics, extending to decision theory, game theory, and economics. Starting from the foundational principles of MWI, we examine how observers interact with branching universes, analyze Newcomb’s paradox in both classical and quantum forms, and discuss applications in quantum game theory and quantum economics. By integrating quantum concepts like superposition, entanglement, and interference, we demonstrate how these ideas resolve classical paradoxes and offer novel frameworks for modeling complex systems. Mathematical formulations are presented using Unicode symbols for clarity. The many-worlds interpretation of quantum mechanics, proposed by Hugh Everett III in 1957, posits that the universe branches into multiple parallel realities during quantum measurements, avoiding the wave function collapse postulate. This framework has profound philosophical and practical implications, particularly in understanding decision-making under uncertainty. In this paper, we synthesize discussions on MWI, observer roles in branching, Newcomb’s paradox, its quantum variant, quantum game theory, and quantum economics. These topics form a coherent progression from quantum foundations to applied interdisciplinary fields, highlighting how quantum principles can reshape classical theories.
abstract: This thesis attempts to explain Everettian quantum mechanics from the ground up, such that those with little to no experience in quantum physics can understand it. First, we introduce the history of quantum theory, and some concepts that make up the framework of quantum physics. Through these concepts, we reveal why interpretations are necessary to map the quantum world onto our classical world. We then introduce the Copenhagen interpretation, and how many-worlds differs from it. From there, we dive into the concepts of entanglement and decoherence, explaining how worlds branch in an Everettian universe, and how an Everettian universe can appear as our classical observed world. From there, we attempt to answer common questions about many-worlds and discuss whether there are philosophical ramifications to believing such a theory. Finally, we look at whether the many-worlds interpretation can be proven, and why one might choose to believe it. (abstract)
This unpublished 1990 preprint argues that a crucial distinction in discussions of the many-worlds interpretation of quantum mechanics (MWI) is that between versions of the interpretation positing a physical multiplicity of worlds, and those in which the multiplicity is merely psychological, and due to the splitting of consciousness upon interaction with amplified quantum superpositions. It is argued that Everett's original version of the MWI belongs to the latter class, and that most of the criticisms leveled against the MWI, in particular that it is illogical or incoherent, are not valid against such "psychological-multiplicity" versions. Attempts to derive the quantum-mechanical probabilities from the many-worlds interpretation are reviewed, and Everett's initial derivation is extended in an attempt to show that these are the unique possible probabilities. But there remains a challenge for proponents of the MWI: to show that their interpretation requires probabilities, rather than merely nonprobabilistic indeterminacy. A 2002 preface, revised in 2004, briefly discusses the extent to which I still agree with the claims in the paper. While its derivation of probabilities used, and failed to justify, noncontextuality, I still agree with the paper's general interpretation of the MWI, though not with the MWI itself.
An extraordinary, if circumscribed, positive shift has occurred since the mid‐twentieth century in the perceived status of Hugh Everett III's 1956 theory of the universal wave function of quantum mechanics, now widely called the Many‐Worlds Interpretation (MWI). Everett's starkly new interpretation denied the existence of a separate classical realm, contending that the experimental data can be seen as presenting a state vector for the whole universe. Since there is no state vector collapse, reality as a whole is strictly deterministic. Explained jointly by the dynamical variables and the state vector, “this reality is not the reality we customarily think of, but is a reality composed of many worlds,” wrote Everett's colleague Bryce DeWitt. In this essay, I account briefly for the change of status in conventional scientific terms, yet chiefly in extended terms of three sets of ideas that I argue can be understood to affect believability in both scientific and religious contexts, illuminating helpfully the MWI phenomenon, and its engagement with theology: orthodoxy and heresy, language and reference, and faith and agnosticism. One's orientation relative to the variable content of these dynamic, socially oriented categories helps to make belief in ideas as metaphysically challenging as Everettian Quantum Mechanics, or particular ideas about God, either more or less believable. The categories will have the same function in a theology engaging Everett's theory, and in any theology at all written in a society deeply marked by what I further argue is a subtle, powerful, and pervasive mode of quasi‐scientific thinking we can call societal constructive agnosticism, of which anyone doing theology today must be aware.