Year:

  1.  4
    Intrinsic, Extrinsic, and the Constitutive A Priori.László E. Szabó - 2020 - Foundations of Physics 50 (6):555-567.
    On the basis of what I call physico-formalist philosophy of mathematics, I will develop an amended account of the Kantian–Reichenbachian conception of constitutive a priori. It will be shown that the features attributed to a real object are not possessed by the object as a “thing-in-itself”; they require a physical theory by means of which these features are constituted. It will be seen that the existence of such a physical theory implies that a physical object can possess a property only (...)
    Direct download (2 more)  
    Translate
     
     
    Export citation  
     
    Bookmark  
  2.  13
    Which Worldlines Represent Possible Particle Histories?Samuel C. Fletcher - 2020 - Foundations of Physics 50 (6):582-599.
    Based on three common interpretive commitments in general relativity, I raise a conceptual problem for the usual identification, in that theory, of timelike curves as those that represent the possible histories of particles in spacetime. This problem affords at least three different solutions, depending on different representational and ontological assumptions one makes about the nature of particles, fields, and their modal structure. While I advocate for a cautious pluralism regarding these options, I also suggest that re-interpreting particles as field processes (...)
    Direct download (4 more)  
    Translate
     
     
    Export citation  
     
    Bookmark  
  3.  9
    On the Very Idea of Distant Correlations.Márton Gömöri - 2020 - Foundations of Physics 50 (6):530-554.
    Contemporary debate over laws of nature centers around Humean supervenience, the thesis that everything supervenes on the distribution of non-nomic facts. The key ingredient of this thesis is the idea that nomic-like concepts—law, chance, causation, etc.—are expressible in terms of the regularities of non-nomic facts. Inherent to this idea is the tacit conviction that regularities, “constant conjunctions” of non-nomic facts do supervene on the distribution of non-nomic facts. This paper raises a challenge for this conviction. It will be pointed out (...)
    Direct download (2 more)  
    Translate
     
     
    Export citation  
     
    Bookmark  
  4.  11
    Determinism, Physical Possibility, and Laws of Nature.Balázs Gyenis - 2020 - Foundations of Physics 50 (6):568-581.
    We call attention to different formulations of how physical laws relate to what is physically possible in the philosophical literature, and argue that it may be the case that determinism fails under one formulation but reigns under the other. Whether this is so depends on our view on the nature of laws, and may also depend on the inter-theoretical relationships among our best physical theories, or so shall we argue.
    Direct download (2 more)  
    Translate
     
     
    Export citation  
     
    Bookmark  
  5.  12
    Modality in Physics.Gábor Hofer-Szabó, Joanna Luc & Tomasz Placek - 2020 - Foundations of Physics 50 (6):515-521.
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark  
  6.  8
    Generalised Manifolds as Basic Objects of General Relativity.Joanna Luc - 2020 - Foundations of Physics 50 (6):621-643.
    In this paper non-Hausdorff manifolds as potential basic objects of General Relativity are investigated. One can distinguish four stages of identifying an appropriate mathematical structure to describe physical systems: kinematic, dynamical, physical reasonability, and empirical. The thesis of this paper is that in the context of General Relativity, non-Hausdorff manifolds pass the first two stages, as they enable one to define the basic notions of differential geometry needed to pose the problem of the evolution-distribution of matter and are not in (...)
    Direct download (2 more)  
    Translate
     
     
    Export citation  
     
    Bookmark  
  7.  73
    A Modal Free Lunch.Tim Maudlin - 2020 - Foundations of Physics 50 (6):522-529.
    The meaning and truth conditions for claims about physical modality and causation have been considered problematic since Hume’s empiricist critique. But the underlying semantic commitments that follow from Hume’s empiricism about ideas have long been abandoned by the philosophical community. Once the consequences of that abandonment are properly appreciated, the problems of physical modality and causal locutions fall away, and can be painlessly solved.
    Direct download (2 more)  
    Translate
     
     
    Export citation  
     
    Bookmark  
  8.  9
    Defining a Relativity-Proof Notion of the Present via Spatio-temporal Indeterminism.Thomas Müller - 2020 - Foundations of Physics 50 (6):644-664.
    In this paper we describe a novel approach to defining an ontologically fundamental notion of co-presentness that does not go against the tenets of relativity theory. We survey the possible reactions to the problem of the present in relativity theory, introducing a terminological distinction between a static role of the present, which is served by the relation of simultaneity, and a dynamic role of the present, with the corresponding relation of co-presentness. We argue that both of these relations need to (...)
    Direct download (2 more)  
    Translate
     
     
    Export citation  
     
    Bookmark  
  9.  9
    On the Modal Aspects of Causal Sets.Tomasz Placek - 2020 - Foundations of Physics 50 (6):600-620.
    The possibility question concerns the status of possibilities: do they form an irreducible category of the external reality, or are they merely features of our cognitive framework? If fundamental physics is ever to shed light on this issue, it must be done by some future theory that unifies insights of general relativity and quantum mechanics. The paper investigates one programme of this kind, namely the causal sets programme, as it apparently considers alternative developments of a given system. To evaluate this (...)
    Direct download (2 more)  
    Translate
     
     
    Export citation  
     
    Bookmark  
  10.  18
    Contextual Emergence of Physical Properties.Robert C. Bishop & George F. R. Ellis - 2020 - Foundations of Physics 50 (5):481-510.
    Contextual emergence was originally proposed as an inter-level relation between different levels of description to describe an epistemic notion of emergence in physics. Here, we discuss the ontic extension of this relation to different domains or levels of physical reality using the properties of temperature and molecular shape as detailed case studies. We emphasize the concepts of stability conditions and multiple realizability as key features of contextual emergence. Some broader implications contextual emergence has for the foundations of physics and cognitive (...)
    Direct download (2 more)  
    Translate
     
     
    Export citation  
     
    Bookmark  
  11.  5
    Some Other “No Hole” Spacetimes Properties Are Unstable Too.Juliusz Doboszewski - 2020 - Foundations of Physics 50 (5):379-384.
    Two interesting “no hole” spacetime properties, not being future nakedly singular) are unstable in the fine topology.
    Direct download (2 more)  
    Translate
     
     
    Export citation  
     
    Bookmark  
  12.  8
    The Doppler Effect and the Anisotropy of the Speed of Light.Michał Drągowski & Marta Włodarczyk - 2020 - Foundations of Physics 50 (5):429-440.
    Fundamental incompatibility arises at the interface of quantum mechanics and the special theory of relativity with Einstein synchronization, in which simultaneity is not absolute. It has, however, been shown that a relativistic theory preserving absolute simultaneity allows to formulate Lorentz-covariant quantum theory, at a price of introducing a preferred frame of reference manifesting itself in a directional anisotropy of the speed of light. We show that a supposed method of distinguishing between these two theories based on the Doppler effect is (...)
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark  
  13.  8
    Unitary-Only Quantum Theory Cannot Consistently Describe the Use of Itself: On the Frauchiger–Renner Paradox.R. E. Kastner - 2020 - Foundations of Physics 50 (5):441-456.
    The Frauchiger–Renner Paradox is an extension of paradoxes based on the “Problem of Measurement,” such as Schrödinger’s Cat and Wigner’s Friend. All these paradoxes stem from assuming that quantum theory has only unitary physical dynamics, and the attendant ambiguity about what counts as a ‘measurement’—i.e., the inability to account for the observation of determinate measurement outcomes from within the theory itself. This paper discusses a basic inconsistency arising in the FR scenario at a much earlier point than the derived contradiction: (...)
    Direct download (2 more)  
    Translate
     
     
    Export citation  
     
    Bookmark  
  14.  6
    The Big Bang is a Coordinate Singularity for $$k = -1$$k=-1 Inflationary FLRW Spacetimes.Eric Ling - 2020 - Foundations of Physics 50 (5):385-428.
    We show that the big bang is a coordinate singularity for a large class of \ inflationary FLRW spacetimes which we have dubbed ‘Milne-like.’ By introducing a new set of coordinates, the big bang appears as a past boundary of the universe where the metric is no longer degenerate—a result which has already been investigated in the context of vacuum decay. We generalize their results and approach the problem from a more mathematical perspective. Similar to how investigating the geometrical properties (...)
    Direct download (2 more)  
    Translate
     
     
    Export citation  
     
    Bookmark  
  15.  7
    Polarization of Vacuum Fluctuations: Source of the Vacuum Permittivity and Speed of Light.G. B. Mainland & Bernard Mulligan - 2020 - Foundations of Physics 50 (5):457-480.
    There are two types of fluctuations in the quantum vacuum: type 1 vacuum fluctuations are on shell and can interact with matter in specific, limited ways that have observable consequences; type 2 vacuum fluctuations are off shell and cannot interact with matter. A photon will polarize a type 1, bound, charged lepton–antilepton vacuum fluctuation in much the same manner that it would polarize a dielectric, suggesting the method used here for calculating the permittivity \ of the vacuum. In a model (...)
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark  
  16.  3
    Correction To: Gleason-Type Theorems From Cauchy’s Functional Equation.Victoria J. Wright & Stefan Weigert - 2020 - Foundations of Physics 50 (5):511-514.
    The authors would like to make the corrections to the original article described below.
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark  
  17.  35
    On Representational Redundancy, Surplus Structure, and the Hole Argument.Clara Bradley & James Owen Weatherall - 2020 - Foundations of Physics 50 (4):270-293.
    We address a recent proposal concerning ‘surplus structure’ due to Nguyen et al.. We argue that the sense of ‘surplus structure’ captured by their formal criterion is importantly different from—and in a sense, opposite to—another sense of ‘surplus structure’ used by philosophers. We argue that minimizing structure in one sense is generally incompatible with minimizing structure in the other sense. We then show how these distinctions bear on Nguyen et al.’s arguments about Yang-Mills theory and on the hole argument.
    No categories
    Direct download (6 more)  
     
    Export citation  
     
    Bookmark   3 citations  
  18.  15
    Confessions of a (Cheap) Sophisticated Substantivalist.Carolyn Brighouse - 2020 - Foundations of Physics 50 (4):348-359.
    I illustrate a challenge to a view that is a response to the Hole Argument. The view, sophisticated substantivalism, has been claimed to be the received view. While sophisticated substantivalism has many defenders, there is a fundamental tension in the view that has not received the attention it deserves. Anyone who defends or endorses sophisticated substantivalism, should acknowledge this challenge, and should either show why it is not serious or explain how to respond to it.
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark   1 citation  
  19.  23
    General-Relativistic Covariance.Neil Dewar - 2020 - Foundations of Physics 50 (4):294-318.
    This is an essay about general covariance, and what it says about spacetime structure. After outlining a version of the dynamical approach to spacetime theories, and how it struggles to deal with generally covariant theories, I argue that we should think about the symmetry structure of spacetime rather differently in generally-covariant theories compared to non-generally-covariant theories: namely, as a form of internal rather than external symmetry structure.
    Direct download (2 more)  
    Translate
     
     
    Export citation  
     
    Bookmark   1 citation  
  20.  13
    The Hole Argument, take n.John Dougherty - 2020 - Foundations of Physics 50 (4):330-347.
    I apply homotopy type theory to the hole argument as formulated by Earman and Norton. I argue that HoTT gives a precise sense in which diffeomorphism-related Lorentzian manifolds represent the same spacetime, undermining Earman and Norton’s verificationist dilemma and common formulations of the hole argument. However, adopting this account does not alleviate worries about determinism: general relativity formulated on Lorentzian manifolds is indeterministic using this standard of sameness and the natural formalization of determinism in HoTT. Fixing this indeterminism results in (...)
    Direct download (2 more)  
    Translate
     
     
    Export citation  
     
    Bookmark   1 citation  
  21.  26
    On Representational Capacities, with an Application to General Relativity.Samuel C. Fletcher - 2020 - Foundations of Physics 50 (4):228-249.
    Recent work on the hole argument in general relativity by Weatherall has drawn attention to the neglected concept of models’ representational capacities. I argue for several theses about the structure of these capacities, including that they should be understood not as many-to-one relations from models to the world, but in general as many-to-many relations constrained by the models’ isomorphisms. I then compare these ideas with a recent argument by Belot for the claim that some isometries “generate new possibilities” in general (...)
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark   5 citations  
  22.  19
    The Hole Argument in Homotopy Type Theory.James Ladyman & Stuart Presnell - 2020 - Foundations of Physics 50 (4):319-329.
    The Hole Argument is primarily about the meaning of general covariance in general relativity. As such it raises many deep issues about identity in mathematics and physics, the ontology of space–time, and how scientific representation works. This paper is about the application of a new foundational programme in mathematics, namely homotopy type theory, to the Hole Argument. It is argued that the framework of HoTT provides a natural resolution of the Hole Argument. The role of the Univalence Axiom in the (...)
    Direct download (2 more)  
    Translate
     
     
    Export citation  
     
    Bookmark   1 citation  
  23.  16
    The Hole Argument Against Everything.Joshua Norton - 2020 - Foundations of Physics 50 (4):360-378.
    The Hole Argument was originally formulated by Einstein and it haunted him as he struggled to understand the meaning of spacetime coordinates in the context of the diffeomorphism invariance of general relativity. This argument has since been put to philosophical use by Earman and Norton to argue against a substantival conception of spacetime. In the present work I demonstrate how Earman and Norton’s Hole Argument can be extended to exclude everything and not merely substantival manifolds. These casualties of the hole (...)
    Direct download (2 more)  
    Translate
     
     
    Export citation  
     
    Bookmark   1 citation  
  24.  7
    Regarding ‘Leibniz Equivalence’.Bryan W. Roberts - 2020 - Foundations of Physics 50 (4):250-269.
    Leibniz Equivalence is a principle of applied mathematics that is widely assumed in both general relativity textbooks and in the philosophical literature on Einstein’s hole argument. In this article, I clarify an ambiguity in the statement of this Leibniz Equivalence, and argue that the relevant expression of it for the hole argument is strictly false. I then show that the hole argument still succeeds as a refutation of manifold substantivalism; however, recent proposals that the hole argument is undermined by principles (...)
    Direct download (2 more)  
    Translate
     
     
    Export citation  
     
    Bookmark   1 citation  
  25.  13
    New Perspectives on the Hole Argument.Bryan W. Roberts & James Owen Weatherall - 2020 - Foundations of Physics 50 (4):217-227.
    This special issue of Foundations of Physics collects together articles representing some recent new perspectives on the hole argument in the history and philosophy of physics. Our task here is to introduce those new perspectives.
    Direct download (2 more)  
    Translate
     
     
    Export citation  
     
    Bookmark  
  26.  2
    Riccati Equations as a Scale-Relativistic Gateway to Quantum Mechanics.Saeed Naif Turki Al-Rashid, Mohammed A. Z. Habeeb & Tugdual S. LeBohec - 2020 - Foundations of Physics 50 (3):191-203.
    Applying the resolution–scale relativity principle to develop a mechanics of non-differentiable dynamical paths, we find that, in one dimension, stationary motion corresponds to an Itô process driven by the solutions of a Riccati equation. We verify that the corresponding Fokker–Planck equation is solved for a probability density corresponding to the squared modulus of the solution of the Schrödinger equation for the same problem. Inspired by the treatment of the one-dimensional case, we identify a generalization to time dependent problems in any (...)
    Direct download (2 more)  
    Translate
     
     
    Export citation  
     
    Bookmark  
  27.  2
    A New Version of the Aharonov–Bohm Effect.César R. De Oliveira & Renan G. Romano - 2020 - Foundations of Physics 50 (3):137-146.
    We propose a simple situation in which the magnetic Aharonov–Bohm potential influences the values of the deficiency indices of the initial Schrödinger operator, so determining whether the particle interacts with the solenoid or not. Even with the particle excluded from the magnetic field, the number of self-adjoint extensions of the initial Hamiltonian depends on the magnetic flux. This is a new point of view of the Aharonov–Bohm effect.
    Direct download (2 more)  
    Translate
     
     
    Export citation  
     
    Bookmark  
  28.  12
    Emergence of Time.George F. R. Ellis & Barbara Drossel - 2020 - Foundations of Physics 50 (3):161-190.
    Microphysical laws are time reversible, but macrophysics, chemistry and biology are not. This paper explores how this asymmetry arises due to the cosmological context, where a non-local Direction of Time is imposed by the expansion of the universe. This situation is best represented by an Evolving Block Universe, where local arrows of time emerge in concordance with the Direction of Time because a global Past Condition results in the Second Law of Thermodynamics pointing to the future. At the quantum level, (...)
    Direct download (2 more)  
    Translate
     
     
    Export citation  
     
    Bookmark  
  29.  8
    How the Natural Interpretation of QM Avoids the Recent No-Go Theorem.Anthony Rizzi - 2020 - Foundations of Physics 50 (3):204-215.
    A recent no-go theorem gives an extension of the Wigner’s Friend argument that purports to prove the “Quantum theory cannot consistently describe the use of itself.” The argument is complex and thought provoking, but fails in a straightforward way if one treats QM as a statistical theory in the most fundamental sense, i.e. if one applies the so-called ensemble interpretation. This explanation is given here at an undergraduate level, which can be edifying for experts and students alike. A recent paper (...)
    Direct download (2 more)  
    Translate
     
     
    Export citation  
     
    Bookmark  
  30. f ( R ) Gravity in a Kaluza–Klein Theory with Degenerate Metric.Trevor P. Searight - 2020 - Foundations of Physics 50 (3):147-160.
    f gravity is examined in the context of a five-dimensional Kaluza-Klein theory with degenerate metric. In this theory electromagnetism is described by two vector fields, and there is a reflection symmetry between them which unifies them with gravitation. For matter, it is shown how the Lagrangian may be any function and still generate the same equations of motion, provided that some simple conditions are satisfied. The field equations are derived, and it is found that f gravity is not consistent with (...)
    Direct download (2 more)  
    Translate
     
     
    Export citation  
     
    Bookmark  
  31.  2
    Hardy’s Paradox as a Demonstration of Quantum Irrealism.Nicholas G. Engelbert & Renato M. Angelo - 2020 - Foundations of Physics 50 (2):105-119.
    Hardy’s paradox was originally presented as a demonstration, without inequalities, of the incompatibility between quantum mechanics and the hypothesis of local causality. Equipped with newly developed tools that allow for a quantitative assessment of realism, here we revisit Hardy’s paradox and argue that nonlocal causality is not mandatory for its solution; quantum irrealism suffices.
    Direct download (2 more)  
    Translate
     
     
    Export citation  
     
    Bookmark  
  32.  2
    Reconciling Kinetic and Quantum Theory.B. Gaveau & L. S. Schulman - 2020 - Foundations of Physics 50 (2):55-60.
    We show that in a dilute gas the wave function’s spreading is limited by scattering off other particles. This shows that quantum mechanics can be consistent with the kinetic theory of gases.
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark  
  33.  7
    Relativity and Equivalence in Hilbert Space: A Principle-Theory Approach to the Aharonov–Bohm Effect.Guy Hetzroni - 2020 - Foundations of Physics 50 (2):120-135.
    This paper formulates generalized versions of the general principle of relativity and of the principle of equivalence that can be applied to general abstract spaces. It is shown that when the principles are applied to the Hilbert space of a quantum particle, its law of coupling to electromagnetic fields is obtained. It is suggested to understand the Aharonov-Bohm effect in light of these principles, and the implications for some related foundational controversies are discussed.
    Direct download (3 more)  
     
    Export citation  
     
    Bookmark  
  34.  11
    Randomness? What Randomness?Klaas Landsman - 2020 - Foundations of Physics 50 (2):61-104.
    This is a review of the issue of randomness in quantum mechanics, with special emphasis on its ambiguity; for example, randomness has different antipodal relationships to determinism, computability, and compressibility. Following a philosophical discussion of randomness in general, I argue that deterministic interpretations of quantum mechanics are strictly speaking incompatible with the Born rule. I also stress the role of outliers, i.e. measurement outcomes that are not 1-random. Although these occur with low probability, their very existence implies that the no-signaling (...)
    Direct download (2 more)  
    Translate
     
     
    Export citation  
     
    Bookmark  
  35.  4
    On the Spin Projection Operator and the Probabilistic Meaning of the Bipartite Correlation Function.Ana María Cetto, Andrea Valdés-Hernández & Luis de la Peña - 2020 - Foundations of Physics 50 (1):27-39.
    Spin is a fundamental and distinctive property of the electron, having far-reaching implications. Yet its purely formal treatment often blurs the physical content and meaning of the spin operator and associated observables. In this work we propose to advance in disclosing the meaning behind the formalism, by first recalling some basic facts about the one-particle spin operator. Consistently informed by and in line with the quantum formalism, we then proceed to analyse in detail the spin projection operator correlation function \=\left\langle (...)
    No categories
    Direct download (2 more)  
    Translate
     
     
    Export citation  
     
    Bookmark  
  36.  11
    Entropic Mechanics: Towards a Stochastic Description of Quantum Mechanics.Vitaly Vanchurin - 2020 - Foundations of Physics 50 (1):40-53.
    We consider a stochastic process which is described by a continuous-time Markov chain on only short time-scales and constrained to conserve a number of hidden quantities on long time-scales. We assume that the transition matrix of the Markov chain is given and the conserved quantities are known to exist, but not explicitly given. To study the stochastic dynamics we propose to use the principle of stationary entropy production. Then the problem can be transformed into a variational problem for a suitably (...)
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark  
  37.  8
    Nonlocality Versus Modified Realism.Hervé Zwirn - 2020 - Foundations of Physics 50 (1):1-26.
    A large number of physicists now admit that quantum mechanics is a non-local theory. The EPR argument and the many experiments showing the violation of Bell’s inequalities seem to have confirmed convincingly that quantum mechanics cannot be local. Nevertheless, this conclusion can only be drawn inside a standard realist framework assuming an ontic interpretation of the wave function and viewing the collapse of the wave function as a real change of the physical state of the system. We show that this (...)
    Direct download (2 more)  
    Translate
     
     
    Export citation  
     
    Bookmark  
  38.  7
    Nonlocality Versus Modified Realism.Hervé Zwirn - 2020 - Foundations of Physics 50 (1):1-26.
    A large number of physicists now admit that quantum mechanics is a non-local theory. The EPR argument and the many experiments showing the violation of Bell’s inequalities seem to have confirmed convincingly that quantum mechanics cannot be local. Nevertheless, this conclusion can only be drawn inside a standard realist framework assuming an ontic interpretation of the wave function and viewing the collapse of the wave function as a real change of the physical state of the system. We show that this (...)
    Direct download (2 more)  
    Translate
     
     
    Export citation  
     
    Bookmark  
  39. Nonlocality Versus Modified Realism.Hervé Zwirn - 2020 - Foundations of Physics 50 (1):1-26.
    A large number of physicists now admit that quantum mechanics is a non-local theory. The EPR argument and the many experiments showing the violation of Bell’s inequalities seem to have confirmed convincingly that quantum mechanics cannot be local. Nevertheless, this conclusion can only be drawn inside a standard realist framework assuming an ontic interpretation of the wave function and viewing the collapse of the wave function as a real change of the physical state of the system. We show that this (...)
    No categories
    Direct download (2 more)  
    Translate
     
     
    Export citation  
     
    Bookmark  
  40.  2
    Nonlocality Versus Modified Realism.Hervé Zwirn - 2020 - Foundations of Physics 50 (1):1-26.
    A large number of physicists now admit that quantum mechanics is a non-local theory. The EPR argument and the many experiments showing the violation of Bell’s inequalities seem to have confirmed convincingly that quantum mechanics cannot be local. Nevertheless, this conclusion can only be drawn inside a standard realist framework assuming an ontic interpretation of the wave function and viewing the collapse of the wave function as a real change of the physical state of the system. We show that this (...)
    Direct download (2 more)  
    Translate
     
     
    Export citation  
     
    Bookmark  
 Previous issues
  
Next issues