About this topic
Summary This category concerns approaches which modify quantum mechanics by adding a real dynamical process of wavefunction collapse. Such theories are typically empirically testable, since they agree with the predictions of quantum mechanics on the aggregrate behaviour of large systems but give different predictions on small enough scales. A major challenge for collapse theories is their reconcilation with special relativity.
Key works Ghirardi et al 1986 is the paper which launched the dynamical-collapse program. Tumulka 2006 provides a dynamical collapse theory based on 'flashes' which is compatible with special relativity.
Introductions Ghirardi & Pearle 1990
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91 found
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  1. added 2019-06-13
    Can We Quarantine the Quantum Blight?Craig Callender - manuscript
    In the science fiction novel Quarantine, Greg Egan imagines a universe where interactions with human observers collapse quantum wavefunctions. Aliens, unable to collapse wavefunctions, tire of being slaughtered by these collapses. In response they erect an impenetrable shield around the solar system, protecting the rest of the universe from human interference and locking humanity into a starless Bubble. When confronting scientific realism and the quantum, many philosophers try to do the theoretical counterpart of this fictional practical strategy. Quantum mechanics is (...)
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  2. added 2019-06-06
    Quantum Mechanics and Relational Realism: Logical Causality and Wave Function Collapse.Michael Epperson - 2009 - Process Studies 38 (2):340-367.
    By the relational realist interpretation of wave function collapse, the quantum mechanical actualization of potentia is defined as a decoherence-driven process by which each actualization is conditioned both by physical and logical relations with the actualities conventionally demarked as “environmental” or external to that particular outcome. But by the relational realist interpretation, the actualization-in-process is understood as internally related to these “enironmental” data per the formalism of quantum decoherence. The concept of “actualization via wave function collapse” is accounted for solely (...)
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  3. added 2019-01-23
    From No-Signaling to Spontaneous Localization Theories.Valia Allori - 2019 - International Journal of Quantum Foundations 5:1-10.
    GianCarlo Ghirardi passed away on June 1st, 201. He would have turned 83 on October 28, 2018. He was without any doubt one of the most prominent theoretical physicists working on the foundation and the philosophy of quantum mechanics. In this paper I review some of his achievements and underline how his research influenced the philosophy of physics community.
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  4. added 2019-01-22
    Reality and the Probability Wave.Daniel Shanahan - 2019 - International Journal of Quantum Foundations 5:51-68.
    Effects associated in quantum mechanics with a divisible probability wave are explained as physically real consequences of the equal but opposite reaction of the apparatus as a particle is measured. Taking as illustration a Mach-Zehnder interferometer operating by refraction, it is shown that this reaction must comprise a fluctuation in the reradiation field of complementary effect to the changes occurring in the photon as it is projected into one or other path. The evolution of this fluctuation through the experiment will (...)
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  5. added 2018-06-19
    Quantum Mechanics Between Ontology and Epistemology.Florian J. Boge - 2018 - Springer (European Studies in Philosophy of Science).
    This book explores the prospects of rivaling ontological and epistemic interpretations of quantum mechanics (QM). It concludes with a suggestion for how to interpret QM from an epistemological point of view and with a Kantian touch. It thus refines, extends, and combines existing approaches in a similar direction. -/- The author first looks at current, hotly debated ontological interpretations. These include hidden variables-approaches, Bohmian mechanics, collapse interpretations, and the many worlds interpretation. He demonstrates why none of these ontological interpretations can (...)
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  6. added 2018-06-12
    Losing Your Marbles in Wavefunction Collapse Theories.Rob Clifton & Bradley Monton - 1999 - British Journal for the Philosophy of Science 50 (4):697 - 717.
    Peter Lewis ([1997]) has recently argued that the wavefunction collapse theory of GRW (Ghirardi, Rimini and Weber [1986]) can only solve the problem of wavefunction tails at the expense of predicting that arithmetic does not apply to ordinary macroscopic objects. More specifically, Lewis argues that the GRW theory must violate the enumeration principle: that 'if marble 1 is in the box and marble 2 is in the box and so on through marble n, then all n marbles are in the (...)
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  7. added 2018-05-29
    Could Inelastic Interactions Induce Quantum Probabilistic Transitions?Nicholas Maxwell - 2017 - In Shan Gao (ed.), Collapse of the Wave Function. Cambridge: Cambridge University Press. pp. 257-273.
    What are quantum entities? Is the quantum domain deterministic or probabilistic? Orthodox quantum theory (OQT) fails to answer these two fundamental questions. As a result of failing to answer the first question, OQT is very seriously defective: it is imprecise, ambiguous, ad hoc, non-explanatory, inapplicable to the early universe, inapplicable to the cosmos as a whole, and such that it is inherently incapable of being unified with general relativity. It is argued that probabilism provides a very natural solution to the (...)
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  8. added 2018-05-22
    The Problem of Ontology for Spontaneous Collapse Theories.Bradley Monton - 2004 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 35 (3):407-421.
    The question of how to interpret spontaneous collapse theories of quantum mechanics is an open one. One issue involves what link one should use to go from wave function talk to talk of ordinary macroscopic objects. Another issue involves whether that link should be taken ontologically seriously. In this paper, I ague that the link should be taken ontologically seriously; I argue against an ontology consisting solely of the wave function. I then consider three possible links: the fuzzy link, the (...)
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  9. added 2018-02-17
    Probability in GRW Theory.Roman Frigg & Carl Hoefer - 2007 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 38 (2):371-389.
    GRW Theory postulates a stochastic mechanism assuring that every so often the wave function of a quantum system is `hit', which leaves it in a localised state. How are we to interpret the probabilities built into this mechanism? GRW theory is a firmly realist proposal and it is therefore clear that these probabilities are objective probabilities (i.e. chances). A discussion of the major theories of chance leads us to the conclusion that GRW probabilities can be understood only as either single (...)
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  10. added 2018-02-02
    A New Way of Understanding the Wave Function: Shan Gao: The Meaning of the Wave Function. Cambridge: Cambridge University Press, 2017, X+189pp, $140 HB.Nicholas Maxwell - 2018 - Metascience 27 (1):87-90.
    This is a review of a book by Shan Gao called "The meaning of the wave function", Cambridge: Cambridge University Press, 2017.
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  11. added 2017-09-28
    Ontology for Collapse Theories.Wayne C. Myrvold - 2017 - In Shan Gao (ed.), Collapse of the Wave Function. Cambridge: Cambridge University Press.
    In this chapter, I will discuss what it takes for a dynamical collapse theory to provide a reasonable description of the actual world. I will start with discussions of what is required, in general, of the ontology of a physical theory, and then apply it to the quantum case. One issue of interest is whether a collapse theory can be a quantum state monist theory, adding nothing to the quantum state and changing only its dynamics. Although this was one of (...)
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  12. added 2017-03-06
    Book Reviews. [REVIEW]Gordon Belot - 1997 - International Studies in the Philosophy of Science 11 (3):305-313.
    A review of Rob Clifton (ed.), Perspectives on Quantum Reality: Non-Relativistic, Relativistic, and Field-Theoretic.
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  13. added 2017-02-28
    Karl Popper, Science and Enlightenment.Nicholas Maxwell - 2017 - London: UCL Press.
    Karl Popper is famous for having proposed that science advances by a process of conjecture and refutation. He is also famous for defending the open society against what he saw as its arch enemies – Plato and Marx. Popper’s contributions to thought are of profound importance, but they are not the last word on the subject. They need to be improved. My concern in this book is to spell out what is of greatest importance in Popper’s work, what its failings (...)
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  14. added 2016-12-16
    Lessons of Bell's Theorem: Nonlocality, Yes; Action at a Distance, Not Necessarily.Wayne C. Myrvold - 2016 - In Shan Gao Mary Bell (ed.), Quantum Nonlocality and Reality: 50 Years of Bell's Theorem. Cambridge: Cambridge University Press. pp. 238-260.
    Fifty years after the publication of Bell's theorem, there remains some controversy regarding what the theorem is telling us about quantum mechanics, and what the experimental violations of Bell inequalities are telling us about the world. This chapter represents my best attempt to be clear about what I think the lessons are. In brief: there is some sort of nonlocality inherent in any quantum theory, and, moreover, in any theory that reproduces, even approximately, the quantum probabilities for the outcomes of (...)
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  15. added 2016-12-08
    Relativity Theory May Not Have the Last Word on the Nature of Time: Quantum Theory and Probabilism.Nicholas Maxwell - 2017 - In G. Ghirardi & S. Wuppulur (eds.), Space, Time and the Limits of Human Understanding. Springer. pp. 109-124.
    Two radically different views about time are possible. According to the first, the universe is three dimensional. It has a past and a future, but that does not mean it is spread out in time as it is spread out in the three dimensions of space. This view requires that there is an unambiguous, absolute, cosmic-wide "now" at each instant. According to the second view about time, the universe is four dimensional. It is spread out in both space and time (...)
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  16. added 2016-12-08
    Remarks on the Direction of Time in Quantum Mechanics.Meir Hemmo - 2003 - Philosophy of Science 70 (5):1458-1471.
    I argue that in the many worlds interpretation of quantum mechanics time has no fundamental direction. I further discuss a way to recover thermodynamics in this interpretation using decoherence theory (Zurek and Paz 1994). Albert's proposal to recover thermodynamics from the collapse theory of Ghirardi et al. (1986) is also considered.
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  17. added 2016-07-18
    Primitive Ontology and the Classical World.Valia Allori - 2016 - In R. Kastner, J. Jeknic-Dugic & G. Jaroszkiewicz (eds.), Quantum Structural Studies: Classical Emergence from the Quantum Level. World Scientific. pp. 175-199.
    In this paper I present the common structure of quantum theories with a primitive ontology, and discuss in what sense the classical world emerges from quantum theories as understood in this framework. In addition, I argue that the primitive ontology approach is better at answering this question than the rival wave function ontology approach or any other approach in which the classical world is nonreductively ‘emergent:’ even if the classical limit within this framework needs to be fully developed, the difficulties (...)
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  18. added 2016-03-06
    Is the Quantum World Composed of Propensitons?Nicholas Maxwell - 2007 - In Mauricio Suarez (ed.), Probabilities, Causes and Propensities in Physics. Springer. pp. 221-243.
    In this paper I outline my propensiton version of quantum theory (PQT). PQT is a fully micro-realistic version of quantum theory that provides us with a very natural possible solution to the fundamental wave/particle problem, and is free of the severe defects of orthodox quantum theory (OQT) as a result. PQT makes sense of the quantum world. PQT recovers all the empirical success of OQT and is, furthermore, empirically testable (although not as yet tested). I argue that Einstein almost put (...)
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  19. added 2016-03-03
    La storia del gatto che era sia vivo che morto.Valia Allori - 2009 - In Enrico Giannetto (ed.), Da Archimede a Majorana: la fisica nel suo divenire. Guaraldi. pp. 273-283.
    Questa è la breve storia , forse un poco romanzata, del gatto che, se non forse il più citato, è di sicuro il più bistrattato della storia della fisica e della filosofia: il gatto di Schrödinger.
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  20. added 2015-08-26
    Primitive Ontology in a Nutshell.Valia Allori - 2015 - International Journal of Quantum Foundations 1 (2):107-122.
    The aim of this paper is to summarize a particular approach of doing metaphysics through physics - the primitive ontology approach. The idea is that any fundamental physical theory has a well-defined architecture, to the foundation of which there is the primitive ontology, which represents matter. According to the framework provided by this approach when applied to quantum mechanics, the wave function is not suitable to represent matter. Rather, the wave function has a nomological character, given that its role in (...)
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  21. added 2015-08-25
    Fundamental Physical Theories: Mathematical Structures Grounded on a Primitive Ontology.Valia Allori - 2007 - Dissertation, Rutgers
    In my dissertation I analyze the structure of fundamental physical theories. I start with an analysis of what an adequate primitive ontology is, discussing the measurement problem in quantum mechanics and theirs solutions. It is commonly said that these theories have little in common. I argue instead that the moral of the measurement problem is that the wave function cannot represent physical objects and a common structure between these solutions can be recognized: each of them is about a clear three-dimensional (...)
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  22. added 2015-04-27
    Collapse Theories as Beable Theories.Guido Bacciagaluppi - 2010 - Manuscrito 33 (1):19-54.
    I discuss the interpretation of spontaneous collapse theories, with particular reference to Bell's suggestion that the stochastic jumps in the evolution of the wave function should be considered as local beables of the theory. I develop this analogy in some detail for the case of non-relativistic GRW-type theories, using a generalisation of Bell's notion of beables to POV measures. In the context of CSL-type theories, this strategy appears to fail, and I discuss instead Ghirardi and co-workers' mass-density interpretation and its (...)
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  23. added 2015-03-09
    Six Possible Worlds of Quantum Mechanics.J. S. Bell - 1992 - Foundations of Physics 22 (10):1201-1215.
  24. added 2015-03-09
    6 Possible Worlds of Quantum-Mechanics (Reprinted From Possible Worlds in Humanities Arts and Sciences, Pg 359-373, 1989). [REVIEW]Js Bell - 1992 - Foundations of Physics 22 (10):1201-1215.
  25. added 2015-03-03
    Events and the Ontology of Quantum Mechanics.Mauro Dorato - 2015 - Topoi 34 (2):369-378.
    In the first part of the paper I argue that an ontology of events is precise, flexible and general enough so as to cover the three main alternative formulations of quantum mechanics as well as theories advocating an antirealistic view of the wave function. Since these formulations advocate a primitive ontology of entities living in four-dimensional spacetime, they are good candidates to connect that quantum image with the manifest image of the world. However, to the extent that some form of (...)
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  26. added 2015-03-03
    Laws of Nature and the Reality of the Wave Function.Mauro Dorato - 2015 - Synthese 192 (10):3179-3201.
    In this paper I review three different positions on the wave function, namely: nomological realism, dispositionalism, and configuration space realism by regarding as essential their capacity to account for the world of our experience. I conclude that the first two positions are committed to regard the wave function as an abstract entity. The third position will be shown to be a merely speculative attempt to derive a primitive ontology from a reified mathematical space. Without entering any discussion about nominalism, I (...)
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  27. added 2015-02-22
    Ghirardi GianCarlo, Sneaking a Look at God's Cards. Unraveling the Mysteries of Quantum Mechanics, Princeton University Press, Princeton, NJ (2004) ISBN 0-691-12139-7 (512pp, US$ 35), Translated From the Italian by Gerald Malsbary. [REVIEW]V. Vedral - 2005 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 36 (4):730-731.
  28. added 2015-02-10
    Relativistic State Reduction Dynamics.Daniel J. Bedingham - 2011 - Foundations of Physics 41 (4):686-704.
    A mechanism describing state reduction dynamics in relativistic quantum field theory is outlined. The mechanism involves nonlinear stochastic modifications to the standard description of unitary state evolution and the introduction of a relativistic field in which a quantized degree of freedom is associated to each point in spacetime. The purpose of this field is to mediate in the interaction between classical stochastic influences and conventional quantum fields. The equations of motion are Lorentz covariant, frame independent, and do not result in (...)
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  29. added 2015-02-10
    Speakable and Unspeakable in Quantum Mechanics: Collected Papers on Quantum Philosophy.J. S. Bell - 2004 - Cambridge University Press.
    This book comprises all of John Bell's published and unpublished papers in the field of quantum mechanics, including two papers that appeared after the first edition was published. It also contains a preface written for the first edition, and an introduction by Alain Aspect that puts into context Bell's great contribution to the quantum philosophy debate. One of the leading expositors and interpreters of modern quantum theory, John Bell played a major role in the development of our current understanding of (...)
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  30. added 2015-02-02
    Bloch's Paradox and the Nonlocality of Chance.Brian A. Woodcock - 2007 - International Studies in the Philosophy of Science 21 (2):137 – 156.
    I show how an almost exclusive focus on the simplest case - the case of a single particle - along with the commonplace conception of the single-particle wave function as a scalar field on spacetime contributed to the perception, first brought to light by I. Bloch, that there existed a contradiction between quantum theory with instantaneous state collapses and special relativity. The incompatibility is merely apparent since treating wave-function values as hypersurface dependent avoids the contradiction. After clarifying confusions which fueled (...)
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  31. added 2015-01-19
    Four Tails Problems for Dynamical Collapse Theories.Kelvin J. McQueen - 2015 - Studies in the History and Philosophy of Modern Physics 49:10-18.
    The primary quantum mechanical equation of motion entails that measurements typically do not have determinate outcomes, but result in superpositions of all possible outcomes. Dynamical collapse theories (e.g. GRW) supplement this equation with a stochastic Gaussian collapse function, intended to collapse the superposition of outcomes into one outcome. But the Gaussian collapses are imperfect in a way that leaves the superpositions intact. This is the tails problem. There are several ways of making this problem more precise. But many authors dismiss (...)
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  32. added 2015-01-01
    Entanglement and Relativity.Christopher Gordon Timpson & Harvey Brown - unknown
    This paper surveys some of the questions that arise when we consider how entanglement and relativity are related via the notion of non-locality. We begin by reviewing the role of entangled states in Bell inequality violation and question whether the associated notions of non-locality lead to problems with relativity. The use of entanglement and wavefunction collapse in Einstein's famous incompleteness argument is then considered, before we go on to see how the issue of non-locality is transformed if one considers quantum (...)
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  33. added 2014-12-30
    Review Of: Christopher G. Timpson, Quantum Information Theory and the Foundations of Quantum Mechanics. [REVIEW]Michael E. Cuffaro - 2014 - Philosophy of Science 81 (4):681-684,.
  34. added 2014-12-30
    Quantum Information Theory & the Foundations of Quantum Mechanics.Christopher Gordon Timpson - 2004 - Oxford University Press.
    Quantum Information Theory and the Foundations of Quantum Mechanics is a conceptual analysis of one of the most prominent and exciting new areas of physics, providing the first full-length philosophical treatment of quantum information theory and the questions it raises for our understanding of the quantum world. -/- Beginning from a careful, revisionary, analysis of the concepts of information in the everyday and classical information-theory settings, Christopher G. Timpson argues for an ontologically deflationary account of the nature of quantum information. (...)
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  35. added 2014-12-13
    Larc: A State Reduction Theory of Quantum Measurement. [REVIEW]Michael Simpson - 2011 - Foundations of Physics 41 (10):1648-1663.
    This proposes a new theory of Quantum measurement; a state reduction theory in which reduction is to the elements of the number operator basis of a system, triggered by the occurrence of annihilation or creation (or lowering or raising) operators in the time evolution of a system. It is from these operator types that the acronym ‘LARC’ is derived. Reduction does not occur immediately after the trigger event; it occurs at some later time with probability P t per unit time, (...)
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  36. added 2014-11-30
    Does God Cheat at Dice? Divine Action and Quantum Possibilities.Nicholas T. Saunders - 2000 - Zygon 35 (3):517-544.
    The recent debates concerning divine action in the context of quantum mechanics are examined with particular reference to the work of William Pollard, Robert J. Russell, Thomas Tracy, Nancey Murphy, and Keith Ward. The concept of a quantum mechanical “event” is elucidated and shown to be at the center of this debate. An attempt is made to clarify the claims made by the protagonists of quantum mechanical divine action by considering the measurement process of quantum mechanics in detail. Four possibilities (...)
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  37. added 2014-11-20
    Quantum Reality, Relativistic Causality, and Closing the Epistemic Circle.Wayne C. Myrvold & Joy Christian (eds.) - 2009 - Springer.
    Part I Introduction -/- Passion at a Distance (Don Howard) -/- Part II Philosophy, Methodology and History -/- Balancing Necessity and Fallibilism: Charles Sanders Peirce on the Status of Mathematics and its Intersection with the Inquiry into Nature (Ronald Anderson) -/- Newton’s Methodology (William Harper) -/- Whitehead’s Philosophy and Quantum Mechanics (QM): A Tribute to Abner Shimony (Shimon Malin) -/- Bohr and the Photon (John Stachel) -/- Part III Bell’s Theorem and Nonlocality A. Theory -/- Extending the Concept of an (...)
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  38. added 2014-11-20
    Einstein's Untimely Burial.Wayne C. Myrvold - unknown
    There seems to be a growing consensus that any interpretation of quantum mechanics other than an instrumentalist interpretation will have to abandon the requirement of Lorentz invariance, at least at the fundamental level, preserving at best Lorentz invariance of phenomena. In particular, it is often said that the collapse postulate is incompatible with the demands of relativity. It is the purpose of this paper to argue that such a conclusion is premature, and to defend the view that a covariant account (...)
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  39. added 2014-11-20
    Decoherence and Wavefunction Collapse in Quantum Measurements.Mikio Namiki - 1999 - Foundations of Physics 29 (3):457-464.
    Examining the notion of wavefunction collapse (WFC) in quantum measurements, which came again to be in question in the recent debate on the quantum Zeno effect, we remark that WFC is realized only through decoherence among branch waves by detection, after a spectral decomposition process from an initial object wavefunction to a superposition of branch waves corresponding to relevant measurement propositions. We improve the definition of the decoherence parameter, so as to be fitted to general cases, by which we can (...)
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  40. added 2014-10-27
    The Collapse of Quantum States: A New Interpretation. [REVIEW]Shimon Malin - 1993 - Foundations of Physics 23 (6):881-893.
    The collapse of quantum states is analyzed in terms of a breakdown into two generic phases: Phase I, in which the field of potentialities that the quantum state represents undergoes a discontinuous and unpredictable change into one of the base states which corresponds to the measurement performed, and phase II, in which a transition from the level of potentialities to the level of actualities takes place. Phase I is discussed in relation to a comment about collapse, made by Dirac in (...)
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  41. added 2014-10-27
    Quantum States and Potentialities of Quantum Systems.Shimon Malin - 1986 - Foundations of Physics 16 (12):1297-1305.
    In a previous article it was shown that in general quantum states represent perspectives on the potentialities of quantum systems, rather than the potentialities themselves. In the present paper the following questions are investigated in the context of this result: (1) How do quantum states which undergo collapse transform under pure translations? (2) Under what conditions do quantum states represent the potentialities themselves? Two alternatives are presented in response to the first question: (1) Quantum states are scalars under translations. (2) (...)
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  42. added 2014-09-19
    Time Asymmetry and Quantum Equations of Motion.T. E. Phipps - 1973 - Foundations of Physics 3 (4):435-455.
    Accepted quantum description is stochastic, yet history is nonstochastic, i.e., not representable by a probability distribution. Therefore ordinary quantum mechanics is unsuited to describe history. This is a limitation of the accepted quantum theory, rather than a failing of mechanics in general. To remove the limitation, it would be desirable to find a form of quantum mechanics that describes the future stochastically and the past nonstochastically. For this purpose it proves sufficient to introduce into quantum mechanics, by means of a (...)
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  43. added 2014-08-24
    Coordinate Formalism on Abstract Hilbert Space: Kinematics of a Quantum Measurement. [REVIEW]Alexey A. Kryukov - 2002 - Foundations of Physics 33 (3):407-443.
    Coordinate form of tensor algebra on an abstract (infinite-dimensional) Hilbert space is presented. The developed formalism permits one to naturally include the improper states in the apparatus of quantum theory. In the formalism the observables are represented by the self-adjoint extensions of Hermitian operators. The unitary operators become linear isometries. The unitary evolution and the non-unitary collapse processes are interpreted as isometric functional transformations. Several experiments are analyzed in the new context.
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  44. added 2014-08-07
    Quantum Decoherence and the Approach to Equilibrium.Meir Hemmo & Orly Shenker - 2003 - Philosophy of Science 70 (2):330-358.
    We discuss a recent proposal by Albert (1994a; 1994b; 2000, ch. 7) to recover thermodynamics on a purely dynamical basis, using the quantum theory of the collapse of the wave function by Ghirardi, Rimini, and Weber (1986). We propose an alternative way to explain thermodynamics within no-collapse interpretations of quantum mechanics. Our approach relies on the standard quantum mechanical models of environmental decoherence of open systems (e.g., Joos and Zeh 1985; Zurek and Paz 1994). This paper presents the two approaches (...)
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  45. added 2014-08-03
    Wave-Packet Reduction as a Medium of Communication.Joseph Hall, Christopher Kim, Brien McElroy & Abner Shimony - 1977 - Foundations of Physics 7 (9-10):759-767.
    Using an apparatus in which two scalers register decays from a radioactive source, an observer located near one of the scalers attempted to convey a message to an observer located near the other one by choosing to look or to refrain from looking at his scaler. The results indicate that no message was conveyed. Doubt is thereby thrown upon the hypothesis that the reduction of the wave packet is due to the interaction of the physical apparatus with the psyche of (...)
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  46. added 2014-08-01
    A Conservative Solution to the Stochastic Dynamical Reduction Problem: Case of Spin-Z Measurement of a Spin-1/2 Particle.T. Halabi - 2013 - Foundations of Physics 43 (10):1252-1256.
    Stochastic dynamical reduction for the case of spin-z measurement of a spin-1/2 particle describes a random walk on the spin-z axis. The measurement’s result depends on which of the two points: spin-z=±ħ/2 is reached first. Born’s rule is recovered as long as the expected step size in spin-z is independent of proximity to endpoints. Here, we address the questions raised by this description: (1) When is collapse triggered, and what triggers it? (2) Why is the expected step size in spin-z (...)
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  47. added 2014-07-24
    Quantum Dynamical Reduction and Reality: Replacing Probability Densities with Densities in Real Space. [REVIEW]Giancarlo Ghirardi - 1996 - Erkenntnis 45 (2-3):349 - 365.
    Consideration is given to recent attempts to solve the objectification problem of quantum mechanics by considering nonlinear and stochastic modifications of Schrödinger's evolution equation. Such theories agree with all predictions of standard quantum mechanics concerning microsystems but forbid the occurrence of superpositions of macroscopically different states. It is shown that the appropriate interpretation for such theories is obtained by replacing the probability densities of standard quantum mechanics with mass densities in real space. Criteria allowing a precise characterization of the idea (...)
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  48. added 2014-07-24
    Describing the Macroscopic World: Closing the Circle Within the Dynamical Reduction Program. [REVIEW]G. C. Ghirardi, R. Grassi & F. Benatti - 1995 - Foundations of Physics 25 (1):5-38.
    With reference to recently proposed theoretical models accounting for reduction in terms of a unified dynamics governing all physical processes, we analyze the problem of working out a worldview accommodating our knowledge about natural phenomena. We stress the relevant conceptual differences between the considered models and standard quantum mechanics. In spite of the fact that both theories describe systems within a genuine Hilbert space framework, the peculiar features of the spontaneous reduction models limit drastically the states which are dynamically stable. (...)
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  49. added 2014-07-24
    The Puzzling Entanglement of Schrödinger's Wave Function.G. C. Ghirardi, A. Rimini & T. Weber - 1988 - Foundations of Physics 18 (1):1-27.
    A brief review of the conceptual difficulties met by the quantum formalism is presented. The main attempts to overcome these difficulties are considered and their limitations are pointed out. A recent proposal based on the assumption of the occurrence of a specific type of wave function collapse is discussed and its consequences for the above-mentioned problems are analyzed.
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  50. added 2014-07-23
    Interneuronal Macroscopic Quantum Coherence in the Brain Cortex! The Role of the Intrasynaptic Adhesive Proteins Beta-Neurexin and Neuroligin-.Danko Georgiev - manuscript
    There are many blank areas in understanding the brain dynamics and especially how it gives rise to consciousness. Quantum mechanics is believed to be capable of explaining the enigma of conscious experience, however till now there is not good enough model considering both the data from clinical neurology and having some explanatory power! In this paper is presented a novel model in defence of macroscopic quantum events within and between neural cells. The beta-neurexin-neuroligin-1 link is claimed to be not just (...)
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