23 found
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  1. Unified dynamics for microscopic and macroscopic systems.GianCarlo Ghirardi, Alberto Rimini & Tullio Weber - 1986 - Physical Review D 34 (D):470–491.
  2.  44
    Collapse theories.Giancarlo Ghirardi - 2008 - Stanford Encyclopedia of Philosophy.
    Quantum mechanics, with its revolutionary implications, has posed innumerable problems to philosophers of science. In particular, it has suggested reconsidering basic concepts such as the existence of a world that is, at least to some extent, independent of the observer, the possibility of getting reliable and objective knowledge about it, and the possibility of taking (under appropriate circumstances) certain properties to be objectively possessed by physical systems. It has also raised many others questions which are well known to those involved (...)
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  3.  20
    Outcome predictions and property attribution: the EPR argument reconsidered.GianCarlo Ghirardi & Renata Grassi - 1994 - Studies in History and Philosophy of Science Part A 25 (3):397-423.
    We reconsider the nonlocal aspects of quantum mechanics with special reference to the EPR argument. We first confine our considerations to the correlations between the outcomes of measurements on spatially distant constituents, without worrying about the measurement problem. We pay particular attention to the relativistic aspects of the problem. Our first conclusion is that, when developed along the lines we follow, the EPR inference that quantum correlations and locality together imply incompleteness, is appropriate. We then investigate whether the other common (...)
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  4.  45
    More about Dynamical Reduction and the Enumeration Principle.Angelo Bassi & GianCarlo Ghirardi - 1999 - British Journal for the Philosophy of Science 50 (4):719-734.
    In view of the arguments put forward by Clifton and Monton [this volume], we reconsider the alleged conflict of dynamical reduction models with the enumeration principle. We prove that our original analysis of such a problem is correct, that the GRW model does not meet any difficulty and that the reasoning of the above authors is inappropriate since it does not take into account the correct interpretation of the dynamical reduction theories.
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  5. Counting marbles: Reply to Clifton and Monton.Angelo Bassi & GianCarlo Ghirardi - 2001 - British Journal for the Philosophy of Science 52 (1):125-130.
  6. Does Quantum Nonlocality Irremediably Conflict with Special Relativity?GianCarlo Ghirardi - 2010 - Foundations of Physics 40 (9-10):1379-1395.
    We reconsider the problem of the compatibility of quantum nonlocality and the requests for a relativistically invariant theoretical scheme. We begin by discussing a recent important paper by T. Norsen on this problem and we enlarge our considerations to give a general picture of the conceptually relevant issue to which this paper is devoted.
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  7.  81
    Local Measurements of Nonlocal Observables and the Relativistic Reduction Process.GianCarlo Ghirardi - 2000 - Foundations of Physics 30 (9):1337-1385.
    In this paper we reconsider the constraints which are imposed by relativistic requirements to any model of dynamical reduction. We review the debate on the subject and we call attention on the fundamental contributions by Aharonov and Albert. Having done this we present a new formulation, which is much simpler and more apt for our analysis, of the proposal put forward by these authors to perform measurements of nonlocal observables by means of local interactions and detections. We take into account (...)
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  8.  56
    The Conway-Kochen Argument and Relativistic GRW Models.Angelo Bassi & GianCarlo Ghirardi - 2007 - Foundations of Physics 37 (2):169-185.
    In a recent paper, Conway and Kochen proposed what is now known as the “Free Will theorem” which, among other things, should prove the impossibility of combining GRW models with special relativity, i.e., of formulating relativistically invariant models of spontaneous wavefunction collapse. Since their argument basically amounts to a non-locality proof for any theory aiming at reproducing quantum correlations, and since it was clear since very a long time that any relativistic collapse model must be non-local in some way, we (...)
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  9. About Possible Extensions of Quantum Theory.GianCarlo Ghirardi & Raffaele Romano - 2013 - Foundations of Physics 43 (7):881-894.
    Recently it has been claimed that no extension of quantum theory can have improved predictive power, the statement following, according to the authors, from the assumptions of free will and of the correctness of quantum predictions concerning the correlations of measurement outcomes. Here we prove that the argument is basically flawed by an inappropriate use of the assumption of free will. In particular, among other implications, the claim, if correct, would imply that Bohmian Mechanics is incompatible with free will. This (...)
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  10. Quantum Dynamical Reduction and Reality.GianCarlo Ghirardi - unknown
  11.  22
    (1 other version)Elements of Physical Reality, Nonlocality and Stochasticity in Relativistic Dynamical Reduction Models.GianCarlo Ghirardi & Philip Pearle - 1990 - PSA: Proceedings of the Biennial Meeting of the Philosophy of Science Association 1990:35 - 47.
    The problem of getting a relativistic generalization of the CSL dynamical reduction model, which has been presented in part I, is discussed. In so doing we have the opportunity to introduce the idea of a stochastically invariant theory. The theoretical model we present, that satisfies this kind of invariance requirement, offers us the possibility to reconsider, from a new point of view, some conceptually relevant issues such as nonlocality, the legitimacy of attributing elements of physical reality to physical systems and (...)
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  12.  9
    (1 other version)Space, Time and the Limits of Human Understanding.Giancarlo Ghirardi & Shyam Wuppuluri (eds.) - 2016 - Cham: Imprint: Springer.
    In this compendium of essays, some of the world's leading thinkers discuss their conceptions of space and time, as viewed through the lens of their own discipline. With an epilogue on the limits of human understanding, this volume hosts contributions from six or more diverse fields. It presumes only rudimentary background knowledge on the part of the reader. Time and again, through the prism of intellect, humans have tried to diffract reality into various distinct, yet seamless, atomic, yet holistic, independent, (...)
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  13.  83
    Reconsidering Mermin’s “In Praise of Measurement”.GianCarlo Ghirardi - 2008 - Foundations of Physics 38 (11):1011-1019.
    We critically analyze a recent paper by D. Mermin and we compare his statements with Bell’s position on the problems he is discussing.
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  14.  27
    First page preview.Jonathan Bain, Timothy Bays, Katherine A. Brading, Stephen G. Brush, Murray Clarke, Sharyn Clough, Jonathan Cohen, Giancarlo Ghirardi, Brendan S. Gillon & Robert G. Hudson - 2004 - International Studies in the Philosophy of Science 18 (2-3).
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  15.  29
    A General Proof of Nonlocality without Inequalities for Bipartite States.GianCarlo Ghirardi & Luca Marinatto - 2009 - In Wayne C. Myrvold & Joy Christian (eds.), Quantum Reality, Relativistic Causality, and Closing the Epistemic Circle. Springer. pp. 95--104.
  16.  73
    (1 other version)Dynamical Reduction Theories: Changing Quantum Theory so the Statevector Represents Reality.GianCarlo Ghirardi & Philip Pearle - 1990 - PSA: Proceedings of the Biennial Meeting of the Philosophy of Science Association 1990:19 - 33.
    The propositions, that what we see around us is real and that reality should be represented by the statevector, conflict with quantum theory. In quantum theory, the statevector can readily become a sum of states of comparable norm, each state representing a different reality. In this paper we present the Continuous Spontaneous Localization (CSL) theory, in which a modified Schrodinger equation, while scarcely affecting the dynamics of a microscopic system, rapidly "reduces" the statevector of a macroscopic system to a state (...)
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  17. Making quantum theory compatible with realism.GianCarlo Ghirardi - 2002 - Foundations of Science 7 (1-2):11-47.
    After a brief account of theway quantum theory deals with naturalprocesses, the crucial problem that such atheory meets, the measurement or, better, themacro-objectification problem is discussed.The embarrassing aspects of the occurrence ofentangled states involving macroscopic systemsare analyzed in details. The famous example ofSchroedinger's cat is presented and it ispointed out how the combined interplay of thesuperposition principle and the ensuingentanglement raises some serious difficultiesin working out a satisfactory quantum worldview, agreeing with our definiteperceptions. The orthodox solution to themacro-objectification problem, i.e. (...)
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  18.  13
    Sneaking a Look at God's Cards, Revised Edition: Unraveling the Mysteries of Quantum Mechanics.Giancarlo Ghirardi - 2007 - Princeton University Press.
    Quantum mechanics describes the behavior of subatomic particles. Since its inception, physicists and philosophers have struggled to work out the meaning of quantum mechanics. This book sets out what we know about the quantum world, how we came to this understanding, where we disagree, and where we are heading in our quest to comprehend it.
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  19.  23
    The Dynamical Reduction Program: An Example of a Quantum Theory without Observers.Giancarlo Ghirardi - 1999 - Vienna Circle Institute Yearbook 7:43-58.
    After more than 70 years of debate about the difficulties that one encounters in working out a coherent view of physical processes based on the standard formulation of quantum mechanics, there is now a widespread belief that such difficulties do not arise from philosophical prejudices but represent precise mathematical and physical challenges which call for a physical solution. As J.S. Bell appropriately stated1 “the way ahead is unromantic in that it requires mathematical work by theoretical physicists, rather than interpretations by (...)
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  20.  43
    The parts and the whole: Collapse theories and systems with identical constituents.GianCarlo Ghirardi - 2013 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 44 (1):40-47.
    The very formal structure of quantum mechanics implies the loss of individuality of physical systems and it requires to look at the Universe as an unbroken whole. The main reason for which, within such a theory, one must renounce to a clear identification of the parts and the whole is the superposition principle which stays at the basis of the theory. It implies, as well known, the phenomenon of entanglement which, in the most extreme case, entails that the constituents of (...)
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  21.  56
    Epistemological and Experimental Perspectives on Quantum Physics.Abner Shimony, Helmut Rauch, Giancarlo Ghirardi, Catherine Chevalley, Jean-Marc Lévy-Leblond & Yuri F. Orlov - 2010 - Springer.
    From the very beginning it was realised that quantum physics involves radically new interpretative and epistemological consequences. While hitherto there has been no satisfactory philosophical analysis of these consequences, recent years have witnessed the accomplishment of many experiments to test the foundations of quantum physics, opening up vistas to a completely novel technology: quantum technology. The contributions in the present volume review the interpretative situation, analyze recent fundamental experiments, and discuss the implications of possible future technological applications. Readership: Analytic philosophers (...)
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  22.  65
    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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  23.  30
    Stephen L. Adler, Quantum Theory as an Emergent Phenomenon: The Statistical Mechanics of Matrix Models as the Precursor of Quantum Field Theory. Cambridge: Cambridge University Press , 283 pp., $50.00. [REVIEW]GianCarlo Ghirardi - 2005 - Philosophy of Science 72 (4):642-645.