Related categories

501 found
Order:
1 — 50 / 501
  1. added 2020-05-19
    Change in Entropy as a Function of McTaggart's A-Series and B-Series.Paul Merriam - manuscript
    This careful note is a very initial foray into the issue of the change in entropy with respect to both McTaggart’s A-series and his B-series. We find a possible solution to the Past Hypothesis problem.
    Remove from this list   Direct download  
    Translate
     
     
    Export citation  
     
    Bookmark  
  2. added 2020-03-13
    Causation and Time Reversal.Matt Farr - 2016 - British Journal for the Philosophy of Science 71 (1):177-204.
    What would it be for a process to happen backwards in time? Would such a process involve different causal relations? It is common to understand the time-reversal invariance of a physical theory in causal terms, such that whatever can happen forwards in time can also happen backwards in time. This has led many to hold that time-reversal symmetry is incompatible with the asymmetry of cause and effect. This article critiques the causal reading of time reversal. First, I argue that the (...)
    Remove from this list   Direct download (8 more)  
     
    Export citation  
     
    Bookmark   1 citation  
  3. added 2020-02-11
    Symmetries and Reflections: Scientific Essays of Eugene P. Wigner. Walter J. Moore, Michael Scriven.Richard Schlegel - 1967 - Philosophy of Science 34 (4):383-386.
  4. added 2020-01-13
    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.
    Remove from this list   Direct download (3 more)  
     
    Export citation  
     
    Bookmark  
  5. added 2019-10-01
    Large Gauge Transformations and the Strong CP Problem.John Dougherty - forthcoming - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics.
    According to the Standard Model of particle physics, some gauge transformations are physical symmetries. That is, they are mathematical transformations that relate representatives of distinct physical states of affairs. This is at odds with the standard philosophical position according to which gauge transformations are an eliminable redundancy in a gauge theory's representational framework. In this paper I defend the Standard Model's treatment of gauge from an objection due to Richard Healey. If we follow the Standard Model in taking some gauge (...)
    Remove from this list   Direct download (2 more)  
     
    Export citation  
     
    Bookmark  
  6. added 2019-09-13
    The Conventionality of Parastatistics.David John Baker, Hans Halvorson & Noel Swanson - 2015 - British Journal for the Philosophy of Science 66 (4):929-976.
    Nature seems to be such that we can describe it accurately with quantum theories of bosons and fermions alone, without resort to parastatistics. This has been seen as a deep mystery: paraparticles make perfect physical sense, so why don’t we see them in nature? We consider one potential answer: every paraparticle theory is physically equivalent to some theory of bosons or fermions, making the absence of paraparticles in our theories a matter of convention rather than a mysterious empirical discovery. We (...)
    Remove from this list   Direct download (10 more)  
     
    Export citation  
     
    Bookmark   3 citations  
  7. added 2019-09-11
    Deciphering the Algebraic CPT Theorem.Noel Swanson - 2019 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 68:106-125.
    The CPT theorem states that any causal, Lorentz-invariant, thermodynamically well-behaved quantum field theory must also be invariant under a reflection symmetry that reverses the direction of time, flips spatial parity, and conjugates charge. Although its physical basis remains obscure, CPT symmetry appears to be necessary in order to unify quantum mechanics with relativity. This paper attempts to decipher the physical reasoning behind proofs of the CPT theorem in algebraic quantum field theory. Ultimately, CPT symmetry is linked to a systematic reversal (...)
    Remove from this list   Direct download (4 more)  
     
    Export citation  
     
    Bookmark  
  8. added 2019-09-11
    Review of Jonathan Bain’s CPT Invariance and the Spin-Statistics Connection. [REVIEW]Noel Swanson - 2018 - Philosophy of Science 85 (3):530-539.
  9. added 2019-08-15
    Perennial Symmetry Arguments: Aristotle’s Heavenly Cosmology and Noether’s First Theorem.Ryan Miller - forthcoming - Proceedings of the American Catholic Philosophical Association.
    Attempts to find perennial elements in Aristotle’s cosmology are doomed to failure because his distinction of sub- and supra-lunary realms no longer holds. More fruitful approaches to the contemporary importance of Aristotelian cosmology must focus on parities of reasoning rather than content. This paper highlights the striking parallels between Aristotle’s use of symmetry arguments in cosmology and instances of Noether’s First Theorem in contemporary physics. Both observe simple motion, find symmetries in that motion, argue from those symmetries to notions of (...)
    Remove from this list   Direct download  
     
    Export citation  
     
    Bookmark  
  10. added 2019-07-13
    How Dualists Should (Not) Respond to the Objection From Energy Conservation.Alin C. Cucu & J. Brian Pitts - 2019 - Mind and Matter 17 (1):95-121.
    The principle of energy conservation is widely taken to be a se- rious difficulty for interactionist dualism (whether property or sub- stance). Interactionists often have therefore tried to make it satisfy energy conservation. This paper examines several such attempts, especially including E. J. Lowe’s varying constants proposal, show- ing how they all miss their goal due to lack of engagement with the physico-mathematical roots of energy conservation physics: the first Noether theorem (that symmetries imply conservation laws), its converse (that conservation (...)
    Remove from this list   Direct download (4 more)  
     
    Export citation  
     
    Bookmark   2 citations  
  11. added 2019-07-05
    Perspectives On Organisms: Biological Time, Symmetries And Singularities.Maël Montévil & Giuseppe Longo - 2014 - Springer.
    This authored monograph introduces a genuinely theoretical approach to biology. Starting point is the investigation of empirical biological scaling including their variability, which is found in the literature, e.g. allometric relationships, fractals, etc. The book then analyzes two different aspects of biological time: first, a supplementary temporal dimension to accommodate proper biological rhythms; secondly, the concepts of protension and retention as a means of local organization of time in living organisms. Moreover, the book investigates the role of symmetry in biology, (...)
    Remove from this list  
     
    Export citation  
     
    Bookmark   4 citations  
  12. added 2019-06-06
    How is Spontaneous Symmetry Breaking Possible? Understanding Wigner's Theorem in Light of Unitary Inequivalence.David John Baker & Hans Halvorson - 2013 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 44 (4):464-469.
    We pose and resolve a puzzle about spontaneous symmetry breaking in the quantum theory of infinite systems. For a symmetry to be spontaneously broken, it must not be implementable by a unitary operator in a ground state's GNS representation. But Wigner's theorem guarantees that any symmetry's action on states is given by a unitary operator. How can this unitary operator fail to implement the symmetry in the GNS representation? We show how it is possible for a unitary operator of this (...)
    Remove from this list   Direct download (7 more)  
     
    Export citation  
     
    Bookmark   5 citations  
  13. added 2019-06-06
    Spontaneous Symmetry Breaking in Quantum Systems: Emergence or Reduction?Nicolaas P. Landsman - 2013 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 44 (4):379-394.
    Beginning with Anderson, spontaneous symmetry breaking in infinite quantum systems is often put forward as an example of emergence in physics, since in theory no finite system should display it. Even the correspondence between theory and reality is at stake here, since numerous real materials show ssb in their ground states, although they are finite. Thus against what is sometimes called ‘Earman's Principle’, a genuine physical effect seems theoretically recovered only in some idealisation, disappearing as soon as the idealisation is (...)
    Remove from this list   Direct download (12 more)  
     
    Export citation  
     
    Bookmark   6 citations  
  14. added 2019-06-06
    The “Structure” of Physics: A Case Study.Jill North - 2009 - Journal of Philosophy 106 (2):57-88.
    We are used to talking about the “structure” posited by a given theory of physics, such as the spacetime structure of relativity. What is “structure”? What does the mathematical structure used to formulate a theory tell us about the physical world according to the theory? What if there are different mathematical formulations of a given theory? Do different formulations posit different structures, or are they merely notational variants? I consider the case of Lagrangian and Hamiltonian classical mechanics. I argue that, (...)
    Remove from this list   Direct download (7 more)  
     
    Export citation  
     
    Bookmark   53 citations  
  15. added 2019-06-06
    Invariance Principles as Regulative Ideals: From Wigner to Hilbert: Thomas Ryckman.Thomas Ryckman - 2008 - Royal Institute of Philosophy Supplement 63:63-80.
    Eugene Wigner's several general discussions of symmetry and invariance principles are among the canonical texts of contemporary philosophy of physics. Wigner spoke from a position of authority, having pioneered for recognition of the importance of symmetry principles from nuclear to molecular physics. But perhaps recent commentators have not sufficiently stressed that Wigner always took care to situate the notion of invariance principles with respect to two others, initial conditions and laws of nature. Wigner's first such general consideration of invariance principles, (...)
    Remove from this list   Direct download (8 more)  
     
    Export citation  
     
    Bookmark   2 citations  
  16. added 2019-06-06
    From Proportion to Balance: The Background to Symmetry in Science.Giora Hon & Bernard R. Goldstein - 2005 - Studies in History and Philosophy of Science Part A 36 (1):1-21.
    We call attention to the historical fact that the meaning of symmetry in antiquity—as it appears in Vitruvius’s De architectura—is entirely different from the modern concept. This leads us to the question, what is the evidence for the changes in the meaning of the term symmetry, and what were the different meanings attached to it? We show that the meaning of the term in an aesthetic sense gradually shifted in the context of architecture before the image of the balance was (...)
    Remove from this list   Direct download (2 more)  
     
    Export citation  
     
    Bookmark   6 citations  
  17. added 2019-06-06
    What is a Law of Nature? The Broken-Symmetry Story.Yuri Balashov - 2002 - Southern Journal of Philosophy 40 (4):459-473.
    I argue that the contemporary interplay of cosmology and particle physics in their joint effort to understand the processes at work during the first moments of the big bang has important implications for understanding the nature of lawhood. I focus on the phenomenon of spontaneous symmetry breaking responsible for generating the masses of certain particles. This phenomenon presents problems for the currently fashionable Dretske-Tooley-Armstrong theory and strongly favors a rival nomic ontology of causal powers.
    Remove from this list   Direct download (6 more)  
     
    Export citation  
     
    Bookmark   7 citations  
  18. added 2019-06-06
    Symmetries and Reflections: Scientific Essays.Peter Kirschenmann - 1973 - Studies in History and Philosophy of Science Part A 4 (2):193-207.
    Remove from this list   Direct download (3 more)  
     
    Export citation  
     
    Bookmark  
  19. added 2019-03-22
    Symmetry Breaking and Functional Incompleteness in Biological Systems.Andrej Korenić, Slobodan Perović, Milan Ćirković & Paul-Antoine Miquel - unknown
    Symmetry-based explanations using symmetry breaking as the key explanatory tool have complemented and replaced traditional causal explanations in various domains of physics. The process of spontaneous SB is now a mainstay of contemporary explanatory accounts of large chunks of condensed-matter physics, quantum field theory, nonlinear dynamics, cosmology, and other disciplines. A wide range of empirical research into various phenomena related to symmetries and SB across biological scales has accumulated as well. Led by these results, we identify and explain some common (...)
    Remove from this list   Direct download (2 more)  
     
    Export citation  
     
    Bookmark  
  20. added 2019-03-07
    Quantum Mechanics, Time and Ontology.Valia Allori - 2019 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 66:145-154.
    Against what is commonly accepted in many contexts, it has been recently suggested that both deterministic and indeterministic quantum theories are not time‐reversal invariant, and thus time is handed in a quantum world. In this paper, I analyze these arguments and evaluate possible reactions to them. In the context of deterministic theories, first I show that this conclusion depends on the controversial assumption that the wave‐function is a physically real scalar field in configuration space. Then I argue that answers which (...)
    Remove from this list   Direct download (4 more)  
     
    Export citation  
     
    Bookmark  
  21. added 2019-01-21
    Mathematical Electron Model and the SI Unit 2017 Special Adjustment.Malcolm J. Macleod - manuscript
    Following the 26th General Conference on Weights and Measures are fixed the numerical values of the 4 physical constants ($h, c, e, k_B$). This is premised on the independence of these constants. This article discusses a model of a mathematical electron from which can be defined the Planck units as geometrical objects (mass M=1, time T=2$\pi$ ...). In this model these objects are interrelated via this electron geometry such that once we have assigned values to 2 Planck units then we (...)
    Remove from this list   Direct download  
     
    Export citation  
     
    Bookmark  
  22. 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 (...)
    Remove from this list   Direct download  
     
    Export citation  
     
    Bookmark  
  23. added 2018-10-24
    Matters of Time Directionality in Classical Physics.Jean-Christophe Lindner - manuscript
    This report offers a modern perspective on the question of time directionality as it arises in a semi-classical context, based on key developments in the field of gravitational physics. Important clarifications are achieved regarding, in particular, the concept of time reversal and that of negative energy state. The conditions imposed by the Leibnizian constraint of relational definition of physical attributes is thoroughly examined and significant consequences of applying this consistency requirement are derived. From this analysis emerges an improved understanding of (...)
    Remove from this list   Direct download  
     
    Export citation  
     
    Bookmark  
  24. 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 (...)
    Remove from this list   Direct download  
    Translate
     
     
    Export citation  
     
    Bookmark   1 citation  
  25. 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 (...)
    Remove from this list   Direct download (7 more)  
     
    Export citation  
     
    Bookmark  
  26. 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 (...)
    Remove from this list   Direct download (7 more)  
     
    Export citation  
     
    Bookmark   25 citations  
  27. added 2018-06-05
    Consideration of Symmetry in the Concept of Space Through the Notions of Equilibrium 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 (...)
    Remove from this list   Direct download  
     
    Export citation  
     
    Bookmark  
  28. 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 (...)
    Remove from this list   Direct download (3 more)  
    Translate
     
     
    Export citation  
     
    Bookmark  
  29. 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 (...)
    Remove from this list   Direct download (3 more)  
     
    Export citation  
     
    Bookmark   1 citation  
  30. 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 (...)
    Remove from this list   Direct download (4 more)  
     
    Export citation  
     
    Bookmark  
  31. 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.
    Remove from this list   Direct download (2 more)  
     
    Export citation  
     
    Bookmark   3 citations  
  32. 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 (...)
    Remove from this list   Direct download (4 more)  
     
    Export citation  
     
    Bookmark   2 citations  
  33. 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 (...)
    Remove from this list  
     
    Export citation  
     
    Bookmark   3 citations  
  34. 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, (...)
    Remove from this list   Direct download (6 more)  
     
    Export citation  
     
    Bookmark   29 citations  
  35. added 2018-02-17
    The Physical World as a Blob: Is OSR Really Realism?: Steven French: The Structure of the World: Metaphysics and Representation. Oxford: OUP, 2014, 416pp, ₤50.00 HB.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”).
    Remove from this list   Direct download (5 more)  
     
    Export citation  
     
    Bookmark   1 citation  
  36. added 2017-12-03
    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.
  37. 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 (...)
    Remove from this list   Direct download (2 more)  
     
    Export citation  
     
    Bookmark   13 citations  
  38. 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 (...)
    Remove from this list   Direct download  
     
    Export citation  
     
    Bookmark   2 citations  
  39. 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 (...)
    Remove from this list   Direct download (9 more)  
     
    Export citation  
     
    Bookmark   2 citations  
  40. added 2017-10-09
    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 (...)
    Remove from this list   Direct download (9 more)  
     
    Export citation  
     
    Bookmark   3 citations  
  41. added 2017-10-07
    Aspects of Determinism in Modern Physics.John Earman - 2007 - In .
  42. added 2017-10-06
    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.
  43. 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 (...)
    Remove from this list   Direct download (4 more)  
     
    Export citation  
     
    Bookmark  
  44. 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 (...)
    Remove from this list   Direct download (3 more)  
     
    Export citation  
     
    Bookmark  
  45. 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.
    Remove from this list   Direct download  
    Translate
     
     
    Export citation  
     
    Bookmark  
  46. 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.
    Remove from this list   Direct download (7 more)  
     
    Export citation  
     
    Bookmark   1 citation  
  47. 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 (...)
    Remove from this list   Direct download  
     
    Export citation  
     
    Bookmark   5 citations  
  48. 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 (...)
    Remove from this list   Direct download  
    Translate
     
     
    Export citation  
     
    Bookmark  
  49. 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”; (...)
    Remove from this list   Direct download (5 more)  
     
    Export citation  
     
    Bookmark  
  50. added 2017-05-12
    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 (...)
    Remove from this list   Direct download (6 more)  
     
    Export citation  
     
    Bookmark   2 citations  
1 — 50 / 501