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Beyond the Quantum

Prologue

Antony Valentini

Published Sep 16, 2025• 0 citations
Publisher

Abstract

Abstract The Prologue provides historical perspective and motivation for the book, as well as a preview of its contents. We note the recurring philosophical conflict between ‘perception’ and ‘reality’ down the ages, drawing historical parallels with the Copernican revolution in astronomy and with the rise of atomic theory in thermodynamics. We explain why reality inevitably wins out over perception, despite the perennial scepticism. We show how the notoriously confused theory of quantum physics can be clarified by admitting a reality behind the scenes, that lies beyond our present perceptions. The Prologue ends with an outline of pilot-wave theory and of the main conclusions of the book.

DOI
10.1093/oso/9780198853749.003.0001

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Abstract The Prologue provides historical perspective and motivation for the book, as well as a preview of its contents. We note the recurring philosophical conflict between ‘perception’ and ‘reality’ down the ages, drawing historical parallels with the Copernican revolution in astronomy and with the rise of atomic theory in thermodynamics. We explain why reality inevitably wins out over perception, despite the perennial scepticism. We show how the notoriously confused theory of quantum physics can be clarified by admitting a reality behind the scenes, that lies beyond our present perceptions. The Prologue ends with an outline of pilot-wave theory and of the main conclusions of the book.
Written for advanced undergraduates, physicists, and historians and philosophers of physics, this book tells the story of the development of our understanding of quantum phenomena through the extraordinary years of the first three decades of the twentieth century. Rather than following the standard axiomatic approach, this book adopts a historical perspective, explaining clearly and authoritatively how pioneers such as Heisenberg, Schrodinger, Pauli and Dirac developed the fundamentals of quantum mechanics and merged them into a coherent theory, and why the mathematical infrastructure of quantum mechanics has to be as complex as it is. The author creates a compelling narrative, providing a remarkable example of how physics and mathematics work in practice. The book encourages an enhanced appreciation of the interaction between mathematics, theory and experiment, helping the reader gain a deeper understanding of the development and content of quantum mechanics than any other text at this level.
Despite its intuitive appeal, classical mechanics is just as fraught with conceptual difficulties and problems of interpretation as its quantum replacement. The problems just happen to be rather less obvious, and so more easily overlooked or ignored. Quantum mechanics was born not only from the failure wrought by trying to extend classical physical principles into the microscopic world of atoms and molecules, but also from the failure of some of its most familiar and cherished concepts. To set the scene and prepare for what follows, this Prologue highlights some of the worst offenders, including: space and time; force and energy; the troublesome concept of mass; light waves and the ether; and atoms and the second law of thermodynamics.
Abstract ‘Origins of Pilot-Wave Theory’ delves into the historical origins of pilot-wave theory and clarifies many of the misunderstandings surrounding it. We begin with an account of Louis de Broglie’s work in the 1920s, including his lecture at the famous but widely misunderstood 1927 Solvay conference. We show how this troubled theory has been repeatedly dismissed and frequently misrepresented. We describe the rise of the notorious measurement problem, the widespread confusion about the nature of probability in pilot-wave theory, as well as attempts to associate the theory with mysticism and the paranormal. The chapter ends with a careful assessment of the scientific evidence for nonlocality (action at a distance), in the form of measured violations of Bell’s inequality.
No scientific theory has caused more puzzlement and confusion than quantum theory. Beginning in 1900, the theory developed in fits and starts and found a consistent mathematical framing only when John von Neumann published his Mathematische Grundlagen der Quantenmechanik in 1932 [12]. But even today, we struggle to understand the world as pictured by quantum theory. Physics is supposed to help us to understand the world, and yet quantum theory makes it seem a very strange place. One might be tempted to push aside our puzzlement as the result of our clinging to a primitive worldview. But our puzzlement is not merely a psychological obstacle; it is also an obstacle to the development of physics itself. This obstacle is encountered primarily in our attempts to unify quantum theory and the general theory of relativity. As argued persuasively by Chris Isham (who is represented in this volume), Lee Smolin [10], and others, the primary obstacle between us and future physics is our own failure to understand the conceptual foundations of current physical theories. How, then, are we to make conceptual progress? What is the process by which we find a new perspective, a perspective in which previously puzzling phenomena find a place in an intelligible—and perhaps beautiful—structure? I do not wish to make prescriptions or to claim that conceptual progress can be achieved in only one way. But this book begins with the Ansatz that conceptual progress might be achieved through free creations of the human intellect.