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  1. added 2018-11-10
    Counterfactuals, Irreversible Laws and The Direction of Time.Terrance A. Tomkow - manuscript
    The principle of Information Conservation or Determinism is a governing assumption of physical theory. Determinism has counterfactual consequences. It entails that if the present were different, then the future would be different. But determinism is temporally symmetric: it entails that if the present were different, the past would also have to be different. This runs contrary to our commonsense intuition that what has happened in the future depends on the past in a way the past does not depend on the (...)
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  2. added 2018-10-24
    Matters of Time Directionality in Classical Physics.Jean-Christophe Lindner - manuscript
    A complete and up-to-date analysis of the question of time directionality as it arises in a semi-classical context is provided which is based on key developments related to the theory of gravitation. Important clarifications are achieved regarding the concept of time reversal as a concept independent from the thermodynamic arrow of time. The role played by the Leibnizian constraint of relational definition of physical properties applied to the sign of electric charge and the energy of elementary particles is thoroughly examined (...)
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  3. added 2018-08-14
    Symétrie: Reflexions Sur les Formes Naturelles.Alexandre Guay - 2004 - Dissertation, Universite de Montreal (Canada)
    This thesis is a philosophical analysis, and in particular an ontological one, of symmetries in modern physics. In the first two chapters, the thesis analyzes the foundation of the concept of symmetry, which is defined as an invariance under a possible change to the system being studied. In the rest of the thesis, various philosophical problems concerning particular symmetries are discussed. This begins in the third chapter with an analysis of the formalization of the definition of symmetry given above in (...)
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  4. added 2018-06-08
    Time Reversal Invariance in Quantum Mechanics.Reza Moulavi Ardakani - 2017 - Dissertation, Texas Tech University
    Symmetries have a crucial role in today’s physics. In this thesis, we are mostly concerned with time reversal invariance (T-symmetry). A physical system is time reversal invariant if its underlying laws are not sensitive to the direction of time. There are various accounts of time reversal transformation resulting in different views on whether or not a given theory in physics is time reversal invariant. With a focus on quantum mechanics, I describe the standard account of time reversal and compare it (...)
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  5. added 2018-06-05
    Target Space ≠ Space.Nick Huggett - 2017 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 59:81-88.
    This paper investigates the significance of T-duality in string theory: the indistinguisha- bility with respect to all observables, of models attributing radically different radii to space – larger than the observable universe, or far smaller than the Planck length, say. Two interpretational branch points are identified and discussed. First, whether duals are physically equivalent or not: by considering a duality of the familiar simple harmonic oscillator, I argue that they are. Unlike the oscillator, there are no measurements ‘outside’ string theory (...)
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  6. added 2018-06-05
    Consideration of Symmetry in the Concept of Space Through the Notions of Balance and Equivalence.Ruth Castillo - 2016 - Episteme NS: Revista Del Instituto de Filosofía de la Universidad Central de Venezuela 36 (1):61-70.
    The notion of space is one of the most discussed within classical physics concepts. The works of Copernicus and Galileo, as well as Gassendi´s ideas led to Newton to regard it as substance. This conception of space, allows the notion of symmetry is present in an indirect or implied, within the laws of physics, formed through the notions of equivalence and balance. The aim of this study is to identify the symmetry, through such notions, under the study of indistinction between (...)
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  7. added 2018-06-05
    A Search for New Physics in High-Mass Ditau Events in the ATLAS Detector.Ryan Reece - 2013 - Dissertation, University of Pennsylvania
    This thesis is a work of experimental physics, a search for new physics with the ATLAS experiment. I post this thesis on the PhilArchive because it includes a pedagogical summary of quantum mechanics and the standard model of particle physics in the combination of chapters 1-2 and appendix A. This was my attempt at the end of my PhD of giving a bird's eye view of the standard model, with a thorough bibliography of the publication trail that lead to its (...)
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  8. added 2018-05-09
    On the CPT Theorem.Hilary Greaves & Teruji Thomas - 2014 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 45:46-65.
    We provide a careful development and rigorous proof of the CPT theorem within the framework of mainstream quantum field theory. This is in contrast to the usual rigorous proofs in purely axiomatic frameworks, and non-rigorous proof-sketches in the mainstream approach. We construct the CPT transformation for a general field directly, without appealing to the enumerative classification of representations, and in a manner that is clearly related to the requirements of our proof. Our approach applies equally in Minkowski spacetimes of any (...)
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  9. added 2018-04-24
    The Metaphysics of Invariance.David Schroeren - manuscript
    Fundamental physics contains an important link between properties of elementary particles and continuous symmetries of particle systems. For example, properties such as mass and spin are said to be 'associated' with specific continuous symmetries. -/- These 'associations' have played a key role in the discovery of various new particle kinds, but more importantly: they are thought to provide a deep insight into the nature of physical reality. The link between properties and symmetries has been said to call for a radical (...)
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  10. added 2018-03-30
    Fundamental Physics and the Fine-Structure Constant.Michael A. Sherbon - 2017 - International Journal of Physical Research 5 (2):46-48.
    From the exponential function of Euler’s equation to the geometry of a fundamental form, a calculation of the fine-structure constant and its relationship to the proton-electron mass ratio is given. Equations are found for the fundamental constants of the four forces of nature: electromagnetism, the weak force, the strong force and the force of gravitation. Symmetry principles are then associated with traditional physical measures.
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  11. added 2018-03-03
    Ontic Structural Realism and Quantum Field Theory: Are There Intrinsic Properties at the Most Fundamental Level of Reality?Philipp Berghofer - 2018 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 62:176-188.
    Ontic structural realism refers to the novel, exciting, and widely discussed basic idea that the structure of physical reality is genuinely relational. In its radical form, the doctrine claims that there are, in fact, no objects but only structure, i.e., relations. More moderate approaches state that objects have only relational but no intrinsic properties. In its most moderate and most tenable form, ontic structural realism assumes that at the most fundamental level of physical reality there are only relational properties. This (...)
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  12. added 2018-02-25
    Symmetries and Explanatory Dependencies in Physics.Steven French & Juha Saatsi - 2018 - In Alexander Reutlinger & Juha Saatsi (eds.), Explanation Beyond Causation: Philosophical Perspectives on Non-Causal Explanations. Oxford: Oxford University Press. pp. 185-205.
    Many important explanations in physics are based on ideas and assumptions about symmetries, but little has been said about the nature of such explanations. This chapter aims to fill this lacuna, arguing that various symmetry explanations can be naturally captured in the spirit of the counterfactual-dependence account of Woodward, liberalized from its causal trappings. From the perspective of this account symmetries explain by providing modal information about an explanatory dependence, by showing how the explanandum would have been different, had the (...)
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  13. added 2018-02-18
    Laws and Meta-Laws of Nature: Conservation Laws and Symmetries.Marc Lange - 2007 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 38 (3):457-481.
    Symmetry principles are commonly said to explain conservation laws—and were so employed even by Lagrange and Hamilton, long before Noether's theorem. But within a Hamiltonian framework, the conservation laws likewise entail the symmetries. Why, then, are symmetries explanatorily prior to conservation laws? I explain how the relation between ordinary (i.e., first-order) laws and the facts they govern (a relation involving counterfactuals) may be reproduced one level higher: as a relation between symmetries and the ordinary laws they govern. In that event, (...)
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  14. added 2018-02-17
    The Physical World as a Blob: Is OSR Really Realism?Mauro Dorato - 2016 - Metascience 25 (2):173-181.
    In my review of Steven French's The structure of the world. Metaphysics & Representation. OUP, Oxford, 2014 I argue that the author is forced to navigate between the Scilla of Tegmark’s Pitagoreanism (2008) and the Carybdis of “blobobjectivism” (Horgan and Potrč 2008), namely the claim that the whole physical universe is a single concrete structurally complex but partless cosmos (a “blob”).
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  15. added 2017-12-02
    Symmetry and Asymmetry in Electrodynamics From Rowland to Einstein.Giora Hon & Bernard R. Goldstein - 2006 - Studies in History and Philosophy of Modern Physics 37 (4):635-660.
  16. added 2017-11-08
    New Foundations for Qualitative Physics.Jean Petitot & Barry Smith - 1990 - In J. E. Tiles, G. T. McKee & C. G. Dean (eds.), Evolving Knowledge in Natural Science and Artificial Intelligence. London: Pitman Publishing. pp. 231-49.
    Physical reality is all the reality we have, and so physical theory in the standard sense is all the ontology we need. This, at least, was an assumption taken almost universally for granted by the advocates of exact philosophy for much of the present century. Every event, it was held, is a physical event, and all structure in reality is physical structure. The grip of this assumption has perhaps been gradually weakened in recent years as far as the sciences of (...)
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  17. added 2017-11-03
    Minimal Structural Essentialism: Why Physics Doesn’T Care Which is Which.David Glick - 2015 - In Alexandre Guay & Thomas Pradeu (eds.), Individuals Across the Sciences. Oxford: Oxford University Press. pp. 207-225.
    The ways in which space-time points and elementary particles are modeled share a curious feature: neither seems to specify which basic object has which properties. This chapter sketches the motivation for this claim and searches for an explanation for it. After reviewing several proposals, it argues for a view according to which objects occupy their place in a given relational structure essentially. This view, which is termed minimal structural essentialism, provides a metaphysical grounding for the physical equivalence of models related (...)
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  18. added 2017-10-11
    A New Argument for the Nomological Interpretation of the Wave Function: The Galilean Group and the Classical Limit of Nonrelativistic Quantum Mechanics.Valia Allori - 2017 - International Studies in the Philosophy of Science (2):177-188.
    In this paper I investigate, within the framework of realistic interpretations of the wave function in nonrelativistic quantum mechanics, the mathematical and physical nature of the wave function. I argue against the view that mathematically the wave function is a two-component scalar field on configuration space. First, I review how this view makes quantum mechanics non- Galilei invariant and yields the wrong classical limit. Moreover, I argue that interpreting the wave function as a ray, in agreement many physicists, Galilei invariance (...)
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  19. added 2017-10-08
    The Invisibility of Diffeomorphisms.Sebastian De Haro - 2017 - Foundations of Physics 47 (11):1464-1497.
    I examine the relationship between \\)-dimensional Poincaré metrics and d-dimensional conformal manifolds, from both mathematical and physical perspectives. The results have a bearing on several conceptual issues relating to asymptotic symmetries in general relativity and in gauge–gravity duality, as follows: I draw from the remarkable work by Fefferman and Graham on conformal geometry, in order to prove two propositions and a theorem that characterise which classes of diffeomorphisms qualify as gravity-invisible. I define natural notions of gravity-invisibility that apply to the (...)
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  20. added 2017-10-07
    Aspects of Determinism in Modern Physics.John Earman - 2007 - In .
  21. added 2017-10-05
    Popper and Dingle on Special Relativity and the Issue of Symmetry.Allen Clark Dotson - 2012 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 43 (1):64-68.
  22. added 2017-10-02
    Particle on a Torus Knot: A Hamiltonian Analysis.Praloy Das & Subir Ghosh - 2016 - Foundations of Physics 46 (12):1649-1665.
    We have studied the dynamics and symmetries of a particle constrained to move in a torus knot. The Hamiltonian system turns out to be Second Class in Dirac’s formulation and the Dirac brackets yield novel noncommutative structures. The equations of motion are obtained for a path in general where the knot is present in the particle orbit but it is not restricted to a particular torus. We also study the motion when it is restricted to a specific torus. The rotational (...)
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  23. added 2017-10-02
    Can the Causal Paradoxes of Qm Be Explained in the Framework of Qed?György Darvas - 2009 - Foundations of Science 14 (4):273-280.
    Attemts to explain causal paradoxes of Quantum Mechanics (QM) have tried to solve the problems within the framework of Quantum Electrodynamics (QED). We will show, that this is impossible. The original theory of QED by Dirac (Proc Roy Soc A117:610, 1928) formulated in its preamble four preliminary requirements that the new theory should meet. The first of these requirements was that the theory must be causal. Causality is not to be derived as a consequence of the theory since it was (...)
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  24. added 2017-09-29
    Antimatter in a Trap.John G. Cramer - unknown
    This AV Column is about the Universal Solvent of modern physics which we call antimatter, and about a bottle in which it can be and has been kept. However, before getting to the hardware I want to talk about antimatter as it relates to the fundamental symmetries of the universe.
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  25. added 2017-09-26
    Uniqueness of Embeddings and Space-Time Relationalism.Philip Catton & Graham Solomon - 1988 - Philosophy of Science 55 (2):280-291.
    From recent writings of Brent Mundy and Michael Friedman we reconstruct two different representation-theoretic or embedding accounts of space-time relationalism, involving two different conditions on embeddings: respectively, uniqueness up to symmetry and uniqueness up to indistinguishability. We discuss the properties of these two accounts, and, with respect specifically to Friedman's projects, assess their merits and demerits.
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  26. added 2017-09-18
    What a Structuralist Theory of Properties Could Not Be.Nora Berenstain - 2016 - In Anna Marmodoro & David Yates (ed.), The Metaphysics of Relations. OUP. Oxford University Press.
    Causal structuralism is the view that, for each natural, non-mathematical, non-Cambridge property, there is a causal profile that exhausts its individual essence. On this view, having a property’s causal profile is both necessary and sufficient for being that property. It is generally contrasted with the Humean or quidditistic view of properties, which states that having a property’s causal profile is neither necessary nor sufficient for being that property, and with the double-aspect view, which states that causal profile is necessary but (...)
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  27. added 2017-07-24
    LA CONSIDERACIÓN DE LA SIMETRÍA DENTRO DEL CONCEPTO DE ESPACIO ABSOLUTO A TRAVÉS DE LAS NOCIONES DE EQUILIBRIO Y EQUIVALENCIA.Ruth Castillo - 2016 - Episteme NS: Revista Del Instituto de Filosofía de la Universidad Central de Venezuela 36.
    La noción de espacio representa una de las concepciones más discutidas dentro de la física clásica. Los trabajos de Copérnico y Galileo, así como las ideas de Gassendi, condujeron a Newton a considerarlo como sustancia. Esta concepción del espacio, permite que la noción de simetría se presente de una forma indirecta o implícita, dentro de las leyes de la física, a través de las nociones de equivalencia y equilibrio. El objetivo de este trabajo es la de identificar la simetría, a (...)
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  28. added 2017-06-15
    On the Logical Origin of the Laws Governing the Fundamental Forces of Nature: A New Algebraic-Axiomatic (Matrix) Approach.R. Zahedi - 2017 - In National Institute for Mathematical Sciences (INSMI - CNRS) Publcs., Paris, FRANCE. pp. 1-89.
    In this article, as a new mathematical approach to origin of the laws of nature, using a new basic algebraic axiomatic (matrix) formalism based on the ring theory and Clifford algebras (presented in Sec.2), “it is shown that certain mathematical forms of fundamental laws of nature, including laws governing the fundamental forces of nature (represented by a set of two definite classes of general covariant massive field equations, with new matrix formalisms), are derived uniquely from only a very few axioms”; (...)
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  29. added 2017-05-11
    Sameness and Separability in Gauge Theories.John Dougherty - 2016 - Philosophy of Science 84 (5):1189-1201.
    In the philosophical literature on Yang-Mills theories, field formulations are taken to have more structure and to be local, while curve-based formulations are taken to have less structure and to be nonlocal. I formalize the notion of locality at issue and show that theories with less structure are nonlocal. However, the amount of structure had by some formulation is independent of whether it uses fields or curves. The relevant difference in structure is not a difference in set-theoretic structure. Rather, it (...)
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  30. added 2017-03-10
    QFT, Antimatter, and Symmetry.David Wallace - 2009 - Studies in History and Philosophy of Modern Physics 40 (3):209-222.
    A systematic analysis is made of the relations between the symmetries of a classical field and the symmetries of the one-particle quantum system that results from quantizing that field in regimes where interactions are weak. The results are applied to gain a greater insight into the phenomenon of antimatter.
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  31. added 2017-02-15
    Reply to Curie Virág.Ian Johnston & Ping Wang - 2014 - Dao: A Journal of Comparative Philosophy 13 (4):589-590.
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  32. added 2017-02-15
    Marie Curie: A Life. [REVIEW]T. J. Trenn - 1987 - British Journal for the History of Science 20 (2):232-232.
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  33. added 2017-02-14
    Maria Sklodowska-Curie's Discoveries One Hundred Years Ago and Today.J. Rotblat - 2000 - Dialogue and Universalism 10:157-163.
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  34. added 2017-02-14
    The Broken Bonds with the World.Pawel Ozdowski - 1996 - Poznan Studies in the Philosophy of the Sciences and the Humanities 47:133-156.
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  35. added 2017-02-14
    Laws and Symmetry. [REVIEW]Michael Tooley - 1995 - British Journal for the Philosophy of Science 46 (2):280.
  36. added 2017-02-14
    Laws and Symmetry. [REVIEW]Joel M. Smith - 1993 - Philosophy of Science 60 (4):659.
  37. added 2017-02-14
    What Makes a Physical Theory “Complete”.Andrew Elby, Harvey R. Brown & Sara Foster - 1993 - Foundations of Physics 23 (7).
  38. added 2017-02-13
    Symmetries and Solipsism.Alex Burri - 2003 - In Andreas Bächli & Klaus Petrus (eds.), Monism. Ontos. pp. 9--157.
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  39. added 2017-02-13
    The Symmetry and Complexity of Elections.Donald G. Saari - 1997 - Complexity 2 (3):13-21.
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  40. added 2017-02-13
    MAGI: Analogy-Based Encoding Using Regularity and Symmetry.Ronald W. Ferguson - 1994 - In Ashwin Ram & Kurt Eiselt (eds.), Proceedings of the Sixteenth Annual Conference of the Cognitive Science Society. Erlbaum. pp. 283--288.
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  41. added 2017-02-13
    Dimensions of Number Invariance.Marc Marschark, Norman A. Greenberg & M. Diane Clark - 1983 - Bulletin of the Psychonomic Society 21 (2):108-110.
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  42. added 2017-02-13
    Distance, Symmetry, and Task Affect Right-Left Vs. Up-Down Judgments.Ruth H. Maki & Barbara A. Holzer - 1982 - Bulletin of the Psychonomic Society 20 (4):217-220.
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  43. added 2017-02-13
    On Spontaneous Combustion.J. Z. Fullmer - 1961 - Annals of Science 17 (2):65-80.
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  44. added 2017-02-12
    An Examination of Ultimate Reality Questions: Possibilities for Synthesis in the Context of Symmetry Relations.Ronald Glasberg - 2007 - In B. K. Dalai (ed.), Ultimate Reality and Meaning. Centre of Advanced Study in Sanskrit, University of Pune. pp. 30--4.
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  45. added 2017-02-11
    Wigner's “Unreasonable Effectiveness of Mathematics”, Revisited.Roland Omnès - 2011 - Foundations of Physics 41 (11):1729-1739.
    A famous essay by Wigner is reexamined in view of more recent developments around its topic, together with some remarks on the metaphysical character of its main question about mathematics and natural sciences.
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  46. added 2017-02-11
    Effects, Observables, States, and Symmetries in Physics.David J. Foulis - 2007 - Foundations of Physics 37 (10):1421-1446.
    We show how effect algebras arise in physics and how they can be used to tie together the observables, states and symmetries employed in the study of physical systems. We introduce and study the unifying notion of an effect-observable-state-symmetry-system (EOSS-system) and give both classical and quantum-mechanical examples of EOSS-systems.
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  47. added 2017-02-11
    How the First Partial Transpose Was Written.Dagmar Bruß & Chiara Macchiavello - 2005 - Foundations of Physics 35 (11):1921-1926.
    We tell the tale of the first writing of a partial transpose, without guaranteeing historical authenticity.
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  48. added 2017-02-11
    Some Aspects of Objectivity and Reality in Modern Science.Per-Olov Löwdin - 1992 - Foundations of Physics 22 (1):41-105.
  49. added 2017-02-10
    Making the Case for Conformal Gravity.Philip D. Mannheim - 2012 - Foundations of Physics 42 (3):388-420.
    We review some recent developments in the conformal gravity theory that has been advanced as a candidate alternative to standard Einstein gravity. As a quantum theory the conformal theory is both renormalizable and unitary, with unitarity being obtained because the theory is a PT symmetric rather than a Hermitian theory. We show that in the theory there can be no a priori classical curvature, with all curvature having to result from quantization. In the conformal theory gravity requires no independent quantization (...)
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  50. added 2017-02-09
    Breaking Bad and Philosophy.David R. Koepsell & Robert Arp (eds.) - 2012 - Open Court.
    The hit television drama Breaking Bad is discussed by professional thinkers who compare the major themes of the show with philosophical concepts and answer questions about injustice, retaliation and the potential of everyone to become a ...
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1 — 50 / 494