25 found
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  1. On the Common Structure of Bohmian Mechanics and the Ghirardi-Rimini-Weber Theory.Valia Allori, Sheldon Goldstein, Roderich Tumulka & Nino Zanghi - 2008 - British Journal for the Philosophy of Science 59 (3):353 - 389.
    Bohmian mechanics and the Ghirardi-Rimini-Weber theory provide opposite resolutions of the quantum measurement problem: the former postulates additional variables (the particle positions) besides the wave function, whereas the latter implements spontaneous collapses of the wave function by a nonlinear and stochastic modification of Schrödinger's equation. Still, both theories, when understood appropriately, share the following structure: They are ultimately not about wave functions but about 'matter' moving in space, represented by either particle trajectories, fields on space-time, or a discrete set of (...)
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  2.  90
    Bohmian Mechanics.Roderich Tumulka, Detlef Durr, Sheldon Goldstein & Nino Zanghi - 2009 - Compendium of Quantum Physics.
    Bohmian mechanics is a theory about point particles moving along trajectories. It has the property that in a world governed by Bohmian mechanics, observers see the same statistics for experimental results as predicted by quantum mechanics. Bohmian mechanics thus provides an explanation of quantum mechanics. Moreover, the Bohmian trajectories are defined in a non-conspiratorial way by a few simple laws.
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  3.  71
    On the Common Structure of Bohmian Mechanics and the Ghirardi–Rimini–Weber Theory Dedicated to GianCarlo Ghirardi on the Occasion of His 70th Birthday.Valia Allori, Sheldon Goldstein, Roderich Tumulka & Nino Zanghì - 2008 - British Journal for the Philosophy of Science 59 (3):353-389.
    Bohmian mechanics and the Ghirardi–Rimini–Weber theory provide opposite resolutions of the quantum measurement problem: the former postulates additional variables besides the wave function, whereas the latter implements spontaneous collapses of the wave function by a nonlinear and stochastic modification of Schrödinger's equation. Still, both theories, when understood appropriately, share the following structure: They are ultimately not about wave functions but about ‘matter’ moving in space, represented by either particle trajectories, fields on space-time, or a discrete set of space-time points. The (...)
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  4. Predictions and Primitive Ontology in Quantum Foundations: A Study of Examples.Valia Allori, Sheldon Goldstein, Roderich Tumulka & Nino Zanghi - 2013 - British Journal for the Philosophy of Science (2):axs048.
    A major disagreement between different views about the foundations of quantum mechanics concerns whether for a theory to be intelligible as a fundamental physical theory it must involve a ‘primitive ontology’ (PO), i.e. variables describing the distribution of matter in four-dimensional space–time. In this article, we illustrate the value of having a PO. We do so by focussing on the role that the PO plays for extracting predictions from a given theory and discuss valid and invalid derivations of predictions. To (...)
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  5. Quantum Physics Without Quantum Philosophy.Detlef Dürr, Sheldon Goldstein & Nino Zanghì - 1995 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 26 (2):137-149.
    Quantum philosophy, a peculiar twentieth-century malady, is responsible for most of the conceptual muddle plaguing the foundations of quantum physics. When this philosophy is eschewed, one naturally arrives at Bohmian mechanics, which is what emerges from Schrodinger's equation for a nonrelativistic system of particles when we merely insist that 'particles' means particles. While distinctly non-Newtonian, Bohmian mechanics is a fully deterministic theory of particles in motion, a motion choreographed by the wave function. The quantum formalism emerges when measurement situations are (...)
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  6.  62
    Naive Realism About Operators.Martin Daumer, Detlef Dürr, Sheldon Goldstein & Nino Zanghì - 1996 - Erkenntnis 45 (2-3):379 - 397.
    A source of much difficulty and confusion in the interpretation of quantum mechanics is a naive realism about operators. By this we refer to various ways of taking too seriously the notion of operator-as-observable, and in particular to the all too casual talk about measuring operators that occurs when the subject is quantum mechanics. Without a specification of what should be meant by measuring a quantum observable, such an expression can have no clear meaning. A definite specification is provided by (...)
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  7.  20
    Reality and the Role of the Wavefunction in Quantum Theory.Sheldon Goldstein & Nino Zanghi - unknown
    The most puzzling issue in the foundations of quantum mechanics is perhaps that of the status of the wave function of a system in a quantum universe. Is the wave function objective or subjective? Does it represent the physical state of the system or merely our information about the system? And if the former, does it provide a complete description of the system or only a partial description? We shall address these questions here mainly from a Bohmian perspective, and shall (...)
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  8. On the Classical Limit of Quantum Mechanics.Valia Allori & Nino Zanghi - 2008 - Foundations of Physics 10.1007/S10701-008-9259-4 39 (1):20-32.
    Contrary to the widespread belief, the problem of the emergence of classical mechanics from quantum mechanics is still open. In spite of many results on the ¯h → 0 asymptotics, it is not yet clear how to explain within standard quantum mechanics the classical motion of macroscopic bodies. In this paper we shall analyze special cases of classical behavior in the framework of a precise formulation of quantum mechanics, Bohmian mechanics, which contains in its own structure the possibility of describing (...)
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  9. Quantum Equilibrium and the Origin of Absolute Uncertainty.Detlef Durr, Sheldon Goldstein & Nino Zanghi - 1992 - Journal of Statistical Physics 67:843-907.
     
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  10. Are All Particles Real?Sheldon Goldstein, James Taylor, Roderich Tumulka & Nino Zanghi - 2005 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 36 (1):103-112.
    In Bohmian mechanics elementary particles exist objectively, as point particles moving according to a law determined by a wavefunction. In this context, questions as to whether the particles of a certain species are real---questions such as, Do photons exist? Electrons? Or just the quarks?---have a clear meaning. We explain that, whatever the answer, there is a corresponding Bohm-type theory, and no experiment can ever decide between these theories. Another question that has a clear meaning is whether particles are intrinsically distinguishable, (...)
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  11. The Message of the Quantum?Martin Daumer, Detlef Duerr, Sheldon Goldstein, Tim Maudlin, Roderich Tumulka & Nino Zanghi - unknown
    We criticize speculations to the effect that quantum mechanics is fundamentally about information. We do this by pointing out how unfounded such speculations in fact are. Our analysis focuses on the dubious claims of this kind recently made by Anton Zeilinger.
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  12.  28
    On the Role of Density Matrices in Bohmian Mechanics.Detlef Dürr, Sheldon Goldstein, Roderich Tumulka & Nino Zanghí - 2005 - Foundations of Physics 35 (3):449-467.
  13.  84
    What is Bohmian Mechanics.Valia Allori & Nino Zanghi - 2004 - International Journal of Theoretical Physics 43:1743-1755.
    Bohmian mechanics is a quantum theory with a clear ontology. To make clear what we mean by this, we shall proceed by recalling first what are the problems of quantum mechanics. We shall then briefly sketch the basics of Bohmian mechanics and indicate how Bohmian mechanics solves these problems and clarifies the status and the role of of the quantum formalism.
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  14.  23
    E' completa la descrizione della realta' fisica fornita dalla meccanica quantistica?Valia Allori & Nino Zanghi - 2007 - Il Protagora 9:163-180.
    In this paper (in Italian) we discuss how quantum theories can be thought of as having the same structure. If so, even the theories that appear to be about the wave function are incomplete, even if in a way which is very different from the one Einstein proposed.
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  15.  75
    Seven Steps Toward the Classical World.Valia Allori, Detlef Duerr, Nino Zanghi & Sheldon Goldstein - 2002 - Journal of Optics B 4:482–488.
    Classical physics is about real objects, like apples falling from trees, whose motion is governed by Newtonian laws. In standard quantum mechanics only the wave function or the results of measurements exist, and to answer the question of how the classical world can be part of the quantum world is a rather formidable task. However, this is not the case for Bohmian mechanics, which, like classical mechanics, is a theory about real objects. In Bohmian terms, the problem of the classical (...)
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  16.  20
    Ontologie quantistiche di particelle, campi e lampi.Valia Allori & Nino Zanghi - 2007 - In Vincenzo Fano & Mauro Antonelli (eds.), "Strutture dello spazio tra fisica e psicologia" Teorie e Modelli XII, III. Pitagora. pp. 9-29.
    La meccanica quantistica è una delle più grandi conquiste intellettuali del xx secolo. Le sue leggiregolano il mondo atomico e subatomico e si riverberano su una miriade di fenomeni del mondomacroscopico, dalla formazione dei cristalli alla superconduttività, dalle proprietà dei fluidi a bassatemperatura agli spettri di emissione di una candela che brucia o di una supernova che esplode, daimeccanismi di combustione della fornace solare ai principi di base delle nanotecnologie. Non c’èquasi nulla nel mondo che ci circonda su cui non (...)
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  17.  36
    La Natura Delle Cose: Introduzione Ai Fondamenti E Alla Filosofia Della Fisica.Valia Allori, Mauro Dorato, Federico Laudisa & Nino Zanghi (eds.) - 2005 - Carocci.
    The year 2005 has been named the World Year of Physics in recognition of the 100th anniversary of Albert Einstein's "Miracle Year," in which he published four landmark papers which had deep and great influence on the last and the current century: quantum theory, general relativity, and statistical mechanics. Despite the enormous importance that Einstein’s discoveries played in these theories, most physicists adopt a version of quantum theory which is incompatible with the idea that motivated Einstein in the first place. (...)
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  18. Ontologie Quantistiche di Particelle, Campi E Lampi.Nino Zanghi - unknown
    La meccanica quantistica è una delle più grandi conquiste intellettuali del xx secolo. Le sue leggi regolano il mondo atomico e subatomico e si riverberano su una miriade di fenomeni del mondo macroscopico, dalla formazione dei cristalli alla superconduttività, dalle proprietà dei fluidi a bassa temperatura agli spettri di emissione di una candela che brucia o di una supernova che esplode, dai meccanismi di combustione della fornace solare ai principi di base delle nanotecnologie. Non c’è quasi nulla nel mondo che (...)
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  19.  42
    The Quantum Formalism and the GRW Formalism.Nino Zanghi - unknown
    The Ghirardi–Rimini–Weber (GRW) theory of spontaneous wave function collapse is known to provide a quantum theory without observers, in fact two different ones by using either the matter density ontology (GRWm) or the flash ontology (GRWf). Both theories are known to make predictions different from those of quantum mechanics, but the difference is so small that no decisive experiment can as yet be performed. While some testable deviations from quantum mechanics have long been known, we provide here something that has (...)
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  20.  41
    Bohmian Mechanics.Nino Zanghi - unknown
    Bohmian mechanics is a theory about point particles moving along trajectories. It has the property that in a world governed by Bohmian mechanics, observers see the same statistics for experimental results as predicted by quantum mechanics. Bohmian mechanics thus provides an explanation of quantum mechanics. Moreover, the Bohmian trajectories are defined in a non-conspiratorial way by a few simple laws.
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  21.  17
    A Global Equilibrium as the Foundation of Quantum Randomness.Detlef Dürr, Sheldon Goldstein & Nino Zanghí - 1993 - Foundations of Physics 23 (5):721-738.
    We analyze the origin of quantum randomness within the framework of a completely deterministic theory of particle motion—Bohmian mechanics. We show that a universe governed by this mechanics evolves in such a way as to give rise to the appearance of randomness, with empirical distributions in agreement with the predictions of the quantum formalism. Crucial ingredients in our analysis are the concept of the effective wave function of a subsystem and that of a random system. The latter is a notion (...)
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  22. Quantum Physics Without Quantum Philosophy.Detlef Dürr, Sheldon Goldstein & Nino Zanghì - 1995 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 26 (2):137-149.
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  23.  5
    On the Classical Limit of Quantum Mechanics.Valia Allori & Nino Zanghì - 2009 - Foundations of Physics 39 (1):20-32.
  24.  8
    John Bell Across Space and Time.Nino Zanghi - manuscript
    This is a review of the book Quantum [Un]speakables: From Bell to Quantum Information. Reinhold A. Bertlmann and Anton Zeilinger (editors). xxii + 483 pp. Springer-Verlag, 2002. $89.95.
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  25. James Taylor's Home Page.Nino Zanghi - manuscript
    My new homepage is at jostylr.com . The corresponding e-mail address is jt@jostylr.com . On my new homepage there will be information about Bohmian mechanics, my papers, professional information, and personal information. As of 7/30/04, there is not much there, but it should improve.
     
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