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137 found
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1 — 50 / 137
  1. added 2017-02-11
    Second Quantization of the Stueckelberg Relativistic Quantum Theory and Associated Gauge Fields.L. P. Horwitz & N. Shnerb - 1998 - Foundations of Physics 28 (10):1509-1519.
    The gauge compensation fields induced by the differential operators of the Stueckelberg-Schrödinger equation are discussed, as well as the relation between these fields and the standard Maxwell fields; An action is constructed and the second quantization of the fields carried out using a constraint procedure. The properties of the second quantized matter fields are discussed.
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  2. added 2017-01-24
    Klein's Paradox in a Four-Space Formulation of Dirac's Equation.A. B. Evans - 1991 - Foundations of Physics 21 (6):633-647.
    A 4-space formulation of Dirac's equation gives results formally identical to those of the usual Klein paradox. However, some extra physical detail can be inferred, and this suggests that the most extreme case involves pair production within the potential barrier.
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  3. added 2017-01-16
    Exploring Models of Associative Memory Via Cavity Quantum Electrodynamics.Sarang Gopalakrishnan, Benjamin L. Lev & Paul M. Goldbart - 2012 - Philosophical Magazine 92 (1-3):353-361.
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  4. added 2017-01-16
    All You Need to Know About the Dirac Equation.P. Weinberger - 2008 - Philosophical Magazine 88 (18-20):2585-2601.
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  5. added 2017-01-15
    Léon Rosenfeld and the Challenge of the Vanishing Momentum in Quantum Electrodynamics.Donald Salisbury - 2009 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 40 (4):363-373.
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  6. added 2017-01-15
    Does Quantum Electrodynamics Have an Arrow of Time?David Atkinson - 2006 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 37 (3):528-541.
    Quantum electrodynamics is a time-symmetric theory that is part of the electroweak interaction, which is invariant under a generalized form of this symmetry, the PCT transformation. The thesis is defended that the arrow of time in electrodynamics is a consequence of the assumption of an initial state of high order, together with the quantum version of the equiprobability postulate.
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  7. added 2017-01-15
    Early Quantum Electrodynamics.Sam Schweber - 1995 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 26 (2):201-211.
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  8. added 2017-01-14
    Conceptual Problems in Quantum Electrodynamics: A Contemporary Historical-Philosophical Approach.Mario Bacelar Valente - unknown
    PhD dissertation addressing what can be called conceptual-mathematical anomalies in quantum electrodynamics. This work can be seen as following the line of philosophy of physics studies of quantum field theory that started to emerge in a systematic way in the early eighties of last century. One example is Teller’s work on standard quantum electrodynamics.In this work, by following a historical approach, I will return to the standard version of quantum electrodynamics, which is the only one available when we want to (...)
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  9. added 2016-12-08
    New Curved Spacetime Dirac Equations.G. G. Nyambuya - 2008 - Foundations of Physics 38 (7):665-677.
    I propose three new curved spacetime versions of the Dirac Equation. These equations have been developed mainly to try and account in a natural way for the observed anomalous gyromagnetic ratio of Fermions. The derived equations suggest that particles including the Electron which is thought to be a point particle do have a finite spatial size which is the reason for the observed anomalous gyromagnetic ratio. A serendipitous result of the theory, is that, to of the equation exhibits an asymmetry (...)
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  10. added 2016-04-27
    On Expected Values and “Negative Probability” in 4-Space QED.A. B. Evans - 1998 - Foundations of Physics 28 (2):291-306.
    A proposed 4-space Dirac theory requires modified definitions of expected value and Hermitian operator, because the charge density is not positive definite. However, this does not imply negative probability.
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  11. added 2016-04-26
    The Conceptual Foundations and the Philosophical Aspects of Renormalization Theory.Tian Yu Cao & Silvan S. Schweber - 1993 - Synthese 97 (1):33 - 108.
  12. added 2016-04-26
    Self-Consistent Radiation Reaction in Quantum Optics—Jaynes'influence and a New Example in Cavity Qed.J. H. Eberly - 1993 - In E. T. Jaynes, Walter T. Grandy & Peter W. Milonni (eds.), Physics and Probability: Essays in Honor of Edwin T. Jaynes. Cambridge University Press. pp. 63.
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  13. added 2015-04-06
    The Utility of Naturalness, and How its Application to Quantum Electrodynamics Envisages the Standard Model and Higgs Boson.James D. Wells - 2015 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 49:102-108.
  14. added 2015-03-23
    Collective Electrodynamics: Quantum Foundations of Electromagnetism.Carver A. Mead - 2002 - MIT Press.
    Carver Mead offers a radically new approach to the standard problems of electromagnetic theory.
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  15. added 2015-03-23
    Development of Quantum Electrodynamics.Sin-Itiro Tomonaga - 1973 - In Jagdish Mehra (ed.), The Physicist's Conception of Nature. Boston: Reidel. pp. 404--412.
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  16. added 2015-03-23
    A Report on Quantum Electrodynamics.Julian Schwinger - 1973 - In Jagdish Mehra (ed.), The Physicist's Conception of Nature. Boston: Reidel. pp. 413--429.
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  17. added 2015-02-22
    Contrasting Classical and Quantum Vacuum States in Non-Inertial Frames.Timothy H. Boyer - 2013 - Foundations of Physics 43 (8):923-947.
    Classical electron theory with classical electromagnetic zero-point radiation (stochastic electrodynamics) is the classical theory which most closely approximates quantum electrodynamics. Indeed, in inertial frames, there is a general connection between classical field theories with classical zero-point radiation and quantum field theories. However, this connection does not extend to noninertial frames where the time parameter is not a geodesic coordinate. Quantum field theory applies the canonical quantization procedure (depending on the local time coordinate) to a mirror-walled box, and, in general, each (...)
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  18. added 2015-02-22
    A Case for an Empirically Demonstrable Notion of the Vacuum in Quantum Electrodynamics Independent of Dynamical Fluctuations.Mario Bacelar Valente - 2011 - Journal for General Philosophy of Science / Zeitschrift für Allgemeine Wissenschaftstheorie 42 (2):241-261.
    A re-evaluation of the notion of vacuum in quantum electrodynamics is presented, focusing on the vacuum of the quantized electromagnetic field. In contrast to the ‘nothingness’ associated to the idea of classical vacuum, subtle aspects are found in relation to the vacuum of the quantized electromagnetic field both at theoretical and experimental levels. These are not the usually called vacuum effects. The view defended here is that the so-called vacuum effects are not due to the ground state of the quantized (...)
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  19. added 2015-01-19
    Maxwell Electrodynamics From a Theory of Macroscopically Extended Particles.J. W. G. Wignall - 1990 - Foundations of Physics 20 (2):139-158.
    It is shown that an approach to quantum phenomena in which charged particles are treated as macroscopically extended periodic disturbances in a nonlinear c-number field, interacting with each other via massless excitations of that field, leads almost uniquely to the five basic equations of classical electrodynamics: the Lorentz force law and Maxwell's equations. The fundamental electromagnetic quantity in this approach is the 4-vector potential Aα—interpreted absolutely as a measure of the local shift of each particle off its mass shell—rather than (...)
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  20. added 2015-01-18
    Variational Principles in Dynamics and Quantum Theory.Wolfgang Yourgrau - 1968 - Philadelphia: Saunders.
    Concentrating upon applications that are most relevant to modern physics, this valuable book surveys variational principles and examines their relationship to dynamics and quantum theory. Stressing the history and theory of these mathematical concepts rather than the mechanics, the authors provide many insights into the development of quantum mechanics and present much hard-to-find material in a remarkably lucid, compact form. After summarizing the historical background from Pythagoras to Francis Bacon, Professors Yourgrau and Mandelstram cover Fermat's principle of least time, the (...)
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  21. added 2015-01-17
    Zitterbewegung in External Magnetic Field: Classic Versus Quantum Approach. [REVIEW]Mehran Zahiri-Abyaneh & Mehrdad Farhoudi - 2011 - Foundations of Physics 41 (8):1355-1374.
    We investigate variations of the Zitterbewegung frequency of electron due to an external static and uniform magnetic field employing the expectation value quantum approach, and compare our results with the classical model of spinning particles. We demonstrate that these two so far compatible approaches are not in agreement in the presence of an external uniform static magnetic field, in which the classical approach breaks the usual symmetry of free particles and antiparticles states, i.e. it leads to CP violation. Hence, regarding (...)
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  22. added 2015-01-16
    Einstein's Unification.Jeroen van Dongen - 2010 - Cambridge University Press.
    Why did Einstein tirelessly study unified field theory for more than 30 years? In this book, the author argues that Einstein believed he could find a unified theory of all of nature's forces by repeating the methods he used when he formulated general relativity. The book discusses Einstein's route to the general theory of relativity, focusing on the philosophical lessons that he learnt. It then addresses his quest for a unified theory for electromagnetism and gravity, discussing in detail his efforts (...)
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  23. added 2015-01-15
    The Relation Between Classical and Quantum Electrodynamics.Mario Bacelar Valente - 2011 - Theoria: Revista de Teoría, Historia y Fundamentos de la Ciencia 26 (1):51-68.
    Quantum electrodynamics presents intrinsic limitations in the description of physical processes that make it impossible to recover from it the type of description we have in classical electrodynamics. Hence one cannot consider classical electrodynamics as reducing to quantum electrodynamics and being recovered from it by some sort of limiting procedure. Quantum electrodynamics has to be seen not as a more fundamental theory, but as an upgrade of classical electrodynamics, which permits an extension of classical theory to the description of phenomena (...)
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  24. added 2014-12-30
    A Modified Set of Feynman Postulates in Quantum Mechanics.V. K. Thankappan & P. Gopalakrishna Nambi - 1980 - Foundations of Physics 10 (3-4):217-236.
    Certain modifications, by way of improvement, are proposed for the Feynman postulates in quantum mechanics. These modifications incorporate a criterion for the applicability of the principle of superposition. It is shown that the modified postulates, together with certain assumptions regarding the trajectory of a particle, lead to an expression for the position-momentum uncertainty relationship which is broadly in agreement with the conventional expression. The time-energy uncertainty relationship is, however, found to have a likely place only in the relativistic theory. A (...)
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  25. added 2014-12-26
    Relativistic Quantum Mechanics and Field Theory.F. Strocchi - 2004 - Foundations of Physics 34 (3):501-527.
    The problems which arise for a relativistic quantum mechanics are reviewed and critically examined in connection with the foundations of quantum field theory. The conflict between the quantum mechanical Hilbert space structure, the locality property and the gauge invariance encoded in the Gauss' law is discussed in connection with the various quantization choices for gauge fields.
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  26. added 2014-12-23
    A Superluminal Effect with Oscillating Neutrinos.Eugene V. Stefanovich - unknown
    A simple quantum relativistic model of ν µ − ντ neutrino oscillations in the OPERA experiment is presented. This model suggests that the two components in the neutrino beam are separated in space. After being created in a meson decay, the µ-neutrino moves 18 meters ahead of the beam’s center of energy, while the τ -neutrino is behind. Both neutrinos have subluminal speeds, however the advanced start of the ν µ explains why it arrives in the detector 60 ns earlier (...)
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  27. added 2014-12-23
    Ortho- and Para-Helium in Relativistic Schrödinger Theory.F. Stary & M. Sorg - 2006 - Foundations of Physics 36 (9):1325-1403.
    The characteristic features of ortho- and para-helium are investigated within the framework of Relativistic Schrödinger Theory (RST). The emphasis lies on the conceptual level, where the geometric and physical properties of both RST field configurations are inspected in detail. From the geometric point of view, the striking feature consists in the splitting of the $\mathfrak{u}(2)$ -valued bundle connection $\mathcal{A}_{\mu}$ into an abelian electromagnetic part (organizing the electromagnetic interactions between the two electrons) and an exchange part, which is responsible for their (...)
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  28. added 2014-12-23
    Is Minkowski Space-Time Compatible with Quantum Mechanics?Eugene V. Stefanovich - 2002 - Foundations of Physics 32 (5):673-703.
    In quantum relativistic Hamiltonian dynamics, the time evolution of interacting particles is described by the Hamiltonian with an interaction-dependent term (potential energy). Boost operators are responsible for (Lorentz) transformations of observables between different moving inertial frames of reference. Relativistic invariance requires that interaction-dependent terms (potential boosts) are present also in the boost operators and therefore Lorentz transformations depend on the interaction acting in the system. This fact is ignored in special relativity, which postulates the universality of Lorentz transformations and their (...)
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  29. added 2014-11-24
    The Physical Meaning of Quantization.Emilio Santos - 1992 - Foundations of Physics 22 (3):371-379.
    After analyzing the difficulties for a local realistic interpretation of quantum theory, it is argued that such an interpretation might be possible if some new postulates are added to the standard ones. We propose a stochastic interpretation of quantum theory, which involves the need of joint probability distributions for all relevant observables. The well known problems for the existence of joint distributions are solved by assuming that neither all Hermitian operators correspond to observables nor all density matrices represent physical states. (...)
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  30. added 2014-11-23
    Quantum Mechanics Foundations.Bakytzhan Oralbekov - manuscript
    Gravity remains the most elusive field. Its relationship with the electromagnetic field is poorly understood. Relativity and quantum mechanics describe the aforementioned fields, respectively. Bosons and fermions are often credited with responsibility for the interactions of force and matter. It is shown here that fermions factually determine the gravitational structure of the universe, while bosons are responsible for the three established and described forces. Underlying the relationships of the gravitational and electromagnetic fields is a symmetrical probability distribution of fermions and (...)
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  31. added 2014-11-22
    Symmetry and Integrability in the Classical Model of Zitterbewegung.Yusuf Sucu & Nuri Ünal - 2012 - Foundations of Physics 42 (8):1067-1077.
    We extended the Barut’s classical model of zitterbewegung from 3+1 dimensional spacetime into 2+1 and 1+1 dimensional spacetimes and discussed the symmetry and integrability properties of the model in 2+1, 1+1 and 3+1 dimensions. In these cases, the free particle current or the velocity of the particle can be decomposed as a constant convection current and polarization currents.In 2+1 dimensional spacetime, a velocity of the particle and spin tensor are dependent to each other and the chirality can not be introduced. (...)
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  32. added 2014-11-22
    Gauge-Independence and the Two-Body Problem in QED.J. Sucher - 2000 - Foundations of Physics 30 (3):371-381.
    I describe a gauge-independent approach to the relativistic two-body bound state and scattering problems in quantum field theory. The basic tool is an ordinary three-dimensional equation involving a potential operator V which gets contributions from both irreducible and reducible diagrams. In QED the resultant V is independent of the choice of covariant gauge used for the photon propagator, unlike the kernel in the Bethe–Salpeter equation. As an illustration, a problem concerning spin-independent level shifts in two-body bound states is analyzed.
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  33. added 2014-11-21
    Erratum To: On Virtual Phonons, Photons, and Electrons. [REVIEW]Günter Nimtz - 2010 - Foundations of Physics 40 (9-10):1221-1230.
  34. added 2014-11-02
    Stochastic Optics: A Reaffirmation of the Wave Nature of Light. [REVIEW]Trevor Marshall & Emilio Santos - 1988 - Foundations of Physics 18 (2):185-223.
    Quantum optics does not give a local explanation of the coincidence counts in spatially separated photodetectors. This is the case for a wide variety of phenomena, including the anticorrelated counting rates in the two channels of a beam splitter, the coincident counting rates of the two “photons” in an atomic cascade, and the “antibunching” observed in resonance fluorescence.We propose a local realist theory that explains all of these data in a consistent manner. The theory uses a completely classical description of (...)
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  35. added 2014-10-17
    A Gedanken Spacecraft That Operates Using the Quantum Vacuum (Dynamic Casimir Effect).G. Jordan Maclay & Robert L. Forward - 2004 - Foundations of Physics 34 (3):477-500.
    Conventional rockets are not a suitable technology for interstellar missions. Chemical rockets require a very large weight of propellant, travel very slowly compared to light speed, and require significant energy to maintain operation over periods of years. For example, the 722 kg Voyager spacecraft required 13,600 kg of propellant to launch and would take about 80,000 years to reach the nearest star, Proxima Centauri, about 4.3 light years away. There have been various attempts at developing ideas on which one might (...)
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  36. added 2014-10-15
    Off-Shell Electromagnetism in Manifestly Covariant Relativistic Quantum Mechanics.David Saad, L. P. Horwitz & R. I. Arshansky - 1989 - Foundations of Physics 19 (10):1125-1149.
    Gauge invariance of a manifestly covariant relativistic quantum theory with evolution according to an invariant time τ implies the existence of five gauge compensation fields, which we shall call pre-Maxwell fields. A Lagrangian which generates the equations of motion for the matter field (coinciding with the Schrödinger type quantum evolution equation) as well as equations, on a five-dimensional manifold, for the gauge fields, is written. It is shown that τ integration of the equations for the pre-Maxwell fields results in the (...)
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  37. added 2014-10-14
    The Transformation Properties of World Lines in Relativistic Quantum Mechanical Hamiltonian Models.James A. Lock - 1982 - Foundations of Physics 12 (8):743-757.
    The supposition of the manifest covariance of average trajectory world lines is violated in Hamiltonian formulations of relativistic quantum mechanics. This is due to the nonlinear appearance of particle dynamical variable operators in the Heisenberg picture boosted position, velocity, and momentum operators. The magnitude of this deviation from world line manifest covariance is found to be exceedingly small for a number of common time of flight experiments.
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  38. added 2014-10-13
    Radiation Reaction of a Nonrelativistic Quantum Charged Particle.J. A. E. Roa-Neri & J. L. Jiménez - 2004 - Foundations of Physics 34 (4):547-580.
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  39. added 2014-10-13
    From Electromagnetism to Relativistic Quantum Mechanics.W. A. Rodrigues Jr & J. Vaz Jr - 1998 - Foundations of Physics 28 (5):789-814.
    We study the relationship between Maxwell and Dirac equations for a class of solutions of Maxwell equations that can represent purely electromagnetic particles.
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  40. added 2014-10-12
    Canonical Proper Time Formulation for Physical Systems.James Lindesay & Tepper Gill - 2004 - Foundations of Physics 34 (1):169-182.
    The canonical proper time formulation of relativistic dynamics provides a framework from which one can describe the dynamics of classical and quantum systems using the clock of those very systems. The framework utilizes a canonical transformation on the time variable that is used to describe the dynamics, and does not transform other dynamical variables such as momenta or positions. This means that the time scales of the dynamics are described in terms of the natural local time coordinates, which is the (...)
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  41. added 2014-10-09
    The Electrodynamic 2-Body Problem and the Origin of Quantum Mechanics.C. K. Raju - 2004 - Foundations of Physics 34 (6):937-962.
    We numerically solve the functional differential equations (FDEs) of 2-particle electrodynamics, using the full electrodynamic force obtained from the retarded Lienard–Wiechert potentials and the Lorentz force law. In contrast, the usual formulation uses only the Coulomb force (scalar potential), reducing the electrodynamic 2-body problem to a system of ordinary differential equations (ODEs). The ODE formulation is mathematically suspect since FDEs and ODEs are known to be incompatible; however, the Coulomb approximation to the full electrodynamic force has been believed to be (...)
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  42. added 2014-10-02
    Time Asymmetries in Classical and in Nonclassical Physics.E. J. Post - 1979 - Foundations of Physics 9 (11-12):831-863.
    A comparative study is made of the eigenvalue problems of electromagnetics and quantum mechanics, with special reference to the operations of spatial inversionP and time inversionT. Electromagnetics, which permits closer agreement with the dictates of relativity (when the latter is extended toP andT), exhibits characteristic differences with respect to quantum mechanics. An evaluation of these distinctions is presented against the backdrop of a choice between absolute scalar action and charge versus pseudoscalar action and charge.
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  43. added 2014-10-01
    Thermal Equilibrium Between Radiation and Matter.G. Lanyi - 2003 - Foundations of Physics 33 (3):511-528.
    In 1916, Einstein rederived the blackbody radiation law of Planck that originated the idea of quantized energy one hundred years ago. For this purpose, Einstein introduced the concept of transition probability, which had a profound influence on the development of quantum theory. In this article, we adopt Einstein's assumptions with two exceptions and seek the statistical condition for the thermal equilibrium of matter without referring to the inner details of either statistical thermodynamics or quantum theory. It is shown that the (...)
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  44. added 2014-09-22
    Radiation Reaction of the Classical Off-Shell Relativistic Charged Particle.O. Oron & L. P. Horwitz - 2001 - Foundations of Physics 31 (6):951-966.
    It has been shown by Gupta and Padmanabhan that the radiation reaction force of the Abraham–Lorentz–Dirac equation can be obtained by a coordinate transformation from the inertial frame of an accelerating charged particle to that of the laboratory. We show that the problem may be formulated in a flat space of five dimensions, with five corresponding gauge fields in the framework of the classical version of a fully gauge covariant form of the Stueckelberg–Feynman–Schwinger covariant mechanics (the zero mode fields of (...)
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  45. added 2014-09-19
    New Dialogue on a New Science Between F. Salviati, G. Sagredo, and Simplicio.Constantin Piron - 1989 - Foundations of Physics 19 (8):1017-1025.
    In this dialogue we explain why nonrelativistic and relativistic quantum mechanics are basically the same and how the Lorentz group operates canonically only on the dynamics.
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  46. added 2014-09-12
    The Direction of theZitterbewegung: A Hidden Variable. [REVIEW]Granville A. Perkins - 1976 - Foundations of Physics 6 (2):237-248.
    Whittaker studied Dirac's equation, using prequantum mathematics, and found oscillating vectors corresponding to Schrödinger'sZitterbewegung. An extension of his study, without added assumptions or speculation, reveals the speedc associated at any instant with a direction that can be defined by specification of the Dirac spinor. This direction is hidden from quantum theory because that theory violates the physical principle that coherent amplitudes of the same kind must be added before quadratic quantities are formed from them. Two-component equations are formed from Dirac's (...)
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  47. added 2014-09-09
    Remarks on Einstein's Original Approach Towards a Quantum Theory of Radiation (About the Article "Einstein y El Efecto Compton").Michel Paty - 2013 - Scientiae Studia 11 (1):221-242.
    No artigo "Einstein y el efecto Compton", publicado neste número de SCIENTIÆ UDIA: , os autores estranham o fato de Einstein não ter declarado mais claramente o quanto esse efeito comprovava definitivamente o carácter corpuscular da radiação. A presente nota crítica pretende fornecer elementos adicionais de apreciação que permitam acompanhar o método de exploração do domínio dos quanta elaborado por Einstein, na ausência de uma teoria adequada, e praticado por ele de 1905 à 1925, evidenciando por esse meio propriedades inéditas (...)
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  48. added 2014-09-09
    Threshold Fragmentation Under Dipole Forces.Thomas Pattard & Jan M. Rost - 2001 - Foundations of Physics 31 (3):535-541.
    The threshold law for N-body fragmentation under dipole forces is formulated. It emerges from the energy dependence of the normalization of the correlated continuum wave function for N fragments. It is shown that the dipole threshold law plays a key role in understanding all threshold fragmentation phenomena since it links the classical threshold law for long-range Coulomb interactions to the statistical law for short-range interactions. Furthermore, a tunnelling mechanism is identified as the common feature which occurs for all three classes (...)
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  49. added 2014-09-04
    On Quantum Electrodynamics of Two-Particle Bound States Containing Spinless Particles.David A. Owen - 1994 - Foundations of Physics 24 (2):273-296.
    We develop here the general treatment arising from the Bethe-Salpeter equation for a two-particle bound system in which at least one of the particles is spinless. It is shown that a natural two-component formalism can be formulated for describing the propagators of scalar particles. This leads to a formulation of the Bethe-Salpeter equation in a form very reminiscent of the fermion-fermion case. It is also shown, that using this two-component formulation for spinless particles, the perturbation theory can be systematically developed (...)
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  50. added 2014-09-02
    Extreme Sub-Radiance: Can Quantum Effects Generate Dramatically Longer Atomic Lifetimes? [REVIEW]Shmuel Nussinov & Jeff Tollaksen - 2012 - Foundations of Physics 42 (9):1186-1199.
    The prolongation of lifetimes for an excited atom due to the presence of nearby atoms in the ground state is shown to follow simply from unitarity of the time evolution. We also discuss possible approaches to the detection and the overcoming of various technical obstacles.
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