Results for 'Unitarity'

44 found
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  1.  33
    Unitarity bounds for 4-fermion contact interactions.T. B. Anders, R. von Mellenthin, B. Pfeil & H. Salecker - 1993 - Foundations of Physics 23 (3):399-410.
    In this paper we consider the effect of unitarity bounds sb⩾s≡(E1+E2) cms 2 for the recently proposed types of nonderivative 4-fermion contact interactions. To this purpose we decompose the helicity amplitudes at c.m.s. into partial waves. The bounds are defined to hold for all reaction channels due to the same type of contact interaction. We find sb=τ4π/κ. Here κ is the coupling constant. The factor τ depends on the type of coupling and on the different cases to identify the (...)
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  2. 'Unitarism ili federalizm: k voprosu o budushchei organizatsii gosudarstvennogo prostranstva Rossii'('Unitarianism or Federalism: On the Question of the Future Organization of Russia's State Space').A. B. Zubov - 2000 - Polis 5:32.
  3.  25
    UNITAR'S programme on regional and interregional cooperation.Joel Kurtzman - 1981 - World Futures 17 (3):299-312.
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  4.  32
    Black Hole Unitarity and Antipodal Entanglement.Gerard ’T. Hooft - 2016 - Foundations of Physics 46 (9):1185-1198.
    Hawking particles emitted by a black hole are usually found to have thermal spectra, if not exactly, then by a very good approximation. Here, we argue differently. It was discovered that spherical partial waves of in-going and out-going matter can be described by unitary evolution operators independently, which allows for studies of space-time properties that were not possible before. Unitarity dictates space-time, as seen by a distant observer, to be topologically non-trivial. Consequently, Hawking particles are only locally thermal, but (...)
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  5. Unitarity as Preservation of Entropy and Entanglement in Quantum Systems.Florian Hulpke, Uffe V. Poulsen, Anna Sanpera, Aditi Sen, Ujjwal Sen & Maciej Lewenstein - 2006 - Foundations of Physics 36 (4):477-499.
    The logical structure of Quantum Mechanics (QM) and its relation to other fundamental principles of Nature has been for decades a subject of intensive research. In particular, the question whether the dynamical axiom of QM can be derived from other principles has been often considered. In this contribution, we show that unitary evolutions arise as a consequences of demanding preservation of entropy in the evolution of a single pure quantum system, and preservation of entanglement in the evolution of composite quantum (...)
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  6. Unitarity, Causality and Quantum Gravity.Ted Jacobson - 1991 - In A. Ashtekar & J. Stachel (eds.), Conceptual Problems of Quantum Gravity. Birkhauser. pp. 2--212.
     
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  7.  14
    On Quantum Non-Unitarity as a Basis for the Second Law of Thermodynamics.Ruth Kastner - unknown
    It was first suggested by Albert that the existence of real, physical non-unitarity at the quantum level would yield a complete explanation for the increase of entropy over time in macroscopic systems. An alternative understanding of the source of non-unitarity is presented herein, in terms of the Transactional Interpretation. The present model provides a specific physical justification for Boltzmann’s Stosszahlansatz, thereby changing its status from an ad hoc postulate to a theoretically grounded result, without requiring any change to (...)
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  8.  86
    Selection rules, causality, and unitarity in statistical and quantum physics.A. Kyrala - 1974 - Foundations of Physics 4 (1):31-51.
    The integrodifferential equations satisfied by the statistical frequency functions for physical systems undergoing stochastic transitions are derived by application of a causality principle and selection rules to the Markov chain equations. The result equations can be viewed as generalizations of the diffusion equation, but, unlike the latter, they have a direct bearing onactive transport problems in biophysics andcondensation aggregation problems of astrophysics and phase transition theory. Simple specific examples of the effects of severe selection rules, such as the relaxational Boltzmann (...)
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  9.  59
    The Great Chain of Souls: Leibniz on Soul Unitarism and Soul Kinds.Christian Barth - 2014 - In Dominik Perler & Klaus Corcilius (eds.), Ockham on Emotions in the Divided Soul. Berlin & New York: De Gruyter. pp. 271-298.
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  10.  10
    Substitution et Connaissance: Une Interprétation Unitare de la Théorie Aristotélicienne de la Métaphore.André Laks - 2015 - In David J. Furley & Alexander Nehamas (eds.), Aristotle's Rhetoric: Philosophical Essays. Princeton University Press. pp. 283-306.
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  11.  65
    Why Black Hole Information Loss is Paradoxical.David Wallace - unknown
    I distinguish between two versions of the black hole information-loss paradox. The first arises from apparent failure of unitarity on the spacetime of a completely evaporating black hole, which appears to be non-globally-hyperbolic; this is the most commonly discussed version of the paradox in the foundational and semipopular literature, and the case for calling it `paradoxical' is less than compelling. But the second arises from a clash between a fully-statistical-mechanical interpretation of black hole evaporation and the quantum-field-theoretic description used (...)
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  12. The rotating discs argument defeated.Jeremy Butterfield - 2006 - British Journal for the Philosophy of Science 57 (1):1-45.
    The rotating discs argument against perdurantism has been mostly discussed by metaphysicians, though the argument of course appeals to ideas from classical mechanics, especially about rotation. In contrast, I assess the RDA from the perspective of the philosophy of physics. I argue for three main conclusions. The first conclusion is that the RDA can be formulated more strongly than is usually recognized: it is not necessary to ‘imagine away’ the dynamical effects of rotation. The second is that in general relativity, (...)
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  13.  36
    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 (...)
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  14.  24
    No Purification Ontology, No Quantum Paradoxes.Giacomo Mauro D’Ariano - 2020 - Foundations of Physics 50 (12):1921-1933.
    It is almost universally believed that in quantum theory the two following statements hold: all transformations are achieved by a unitary interaction followed by a von-Neumann measurement; all mixed states are marginals of pure entangled states. I name this doctrine the dogma of purification ontology. The source of the dogma is the original von Neumann axiomatisation of the theory, which largely relies on the Schrődinger equation as a postulate, which holds in a nonrelativistic context, and whose operator version holds only (...)
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  15. Nonseparability and quantum chaos.Frederick M. Kronz - 1998 - Philosophy of Science 65 (1):50-75.
    Conventional wisdom has it that chaotic behavior is either strongly suppressed or absent in quantum models. Indeed, some researchers have concluded that these considerations serve to undermine the correspondence principle, thereby raising serious doubts about the adequacy of quantum mechanics. Thus, the quantum chaos question is a prime subject for philosophical analysis. The most significant reasons given for the absence or suppression of chaotic behavior in quantum models are the linearity of Schrödinger’s equation and the unitarity of the time-evolution (...)
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  16.  46
    An Alternative to the Gauge Theoretic Setting.Bert Schroer - 2011 - Foundations of Physics 41 (10):1543-1568.
    The standard formulation of quantum gauge theories results from the Lagrangian (functional integral) quantization of classical gauge theories. A more intrinsic quantum theoretical access in the spirit of Wigner’s representation theory shows that there is a fundamental clash between the pointlike localization of zero mass (vector, tensor) potentials and the Hilbert space (positivity, unitarity) structure of QT. The quantization approach has no other way than to stay with pointlike localization and sacrifice the Hilbert space whereas the approach built on (...)
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  17.  6
    Sophistical Practice: Toward a Consistent Relativism.Barbara Cassin - 2014 - New York: Fordham University Press.
    Sophistics is the paradigm of a discourse that does things with words. It is not pure rhetoric, as Plato wants us to believe, but it provides an alternative to the philosophical mainstream. A sophistic history of philosophy questions the orthodox philosophical history of philosophy: that of ontology and truth in itself. In this book, we discover unusual Presocratics, wreaking havoc with the fetish of true and false. Their logoi perform politics and perform reality. Their sophistic practice can shed crucial light (...)
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  18. Coincidentia oppositorum de la Sfântul Dionisie Areopagitul la Mircea Eliade.Adrian BOLDIŞOR - 2012 - In Teologie și filosofie în opera Sf. Dionisie Areopagitul. Craiova: Ed. Mitropolia Olteniei. pp. 287-398.
    Coincidenţa contrariilor reprezintă un punct esenţial în gândirea umanităţii, echivalând, în cele din urmă, cu dorinţa omului de a aduna într-un tot unitar pe cele ce se opun în univers. Această preocupare a stat la baza scrierilor unor gânditori importanţi, între care se numără Sfântul Dionisie Areopagitul, Meister Eckhart, Nicolaus Cusanus sau Mircea Eliade. Deşi au scris în perioade de timp diferite şi au aparţinut unor tradiţii diferite, operele lor stau mărturie faptului că motivul coincidentia oppositorum a fost şi continuă (...)
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  19.  22
    Bouncing Unitary Cosmology I. Mini-Superspace General Solution.Sean Gryb & Karim Thebault - unknown
    We offer a new proposal for cosmic singularity resolution based upon a quantum cosmology with a unitary bounce. This proposal is illustrated via a novel quantization of a mini-superspace model in which there can be superpositions of the cosmological constant. This possibility leads to a finite, bouncing unitary cosmology. Whereas the usual Wheeler–DeWitt cosmology generically displays pathological behaviour in terms of non-finite expectation values and non-unitary dynamics, the finiteness and unitarity of our model are formally guaranteed. For classically singular (...)
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  20.  20
    The Quantum-Like Approach of Psychosomatic Phenomena in Application.Pierre Uzan - 2014 - Axiomathes 24 (3):359-374.
    The quantum-like approach of psychosomatic phenomena suggests an explanation of the correlations between mind and body in terms of quantum-like entanglement, that is, without appealing to any concept of psychophysical, efficient causality. This approach is developed within the Hilbert space formalism and its general consequences are drawn. It is first illustrated by a simple, qualitative model of the placebo effect which shows that representing psychosomatic states by entangled states can explain that purely psychological factors can produce a-causal changes of physiological (...)
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  21.  6
    History as a Real Process: Historical Science and Philosophy of History.Yuri Semyonov - 2016 - Epistemology and Philosophy of Science 47 (1):50-56.
    In this article author considers the problem of epistemology of historical knowledge. Author doesn't accept the neo-kantianism theory. He makes an attempt to differ the two forms of unitarization of scientific knowledge — theoretization and the principle of holism and, hence, the two forms of the theoretical consideration of history. The author insists that the Marxists approach seems to be the most relevant from this point of view. Thus, he defends the thesis that the idealistic concepts are much vulnerable comparing (...)
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  22.  1
    Beyond Standard Model Collider Phenomenology of Higgs Physics and Supersymmetry.Marc Christopher Thomas - 2016 - Cham: Imprint: Springer.
    This thesis studies collider phenomenology of physics beyond the Standard Model at the Large Hadron Collider (LHC). It also explores in detail advanced topics related to Higgs boson and supersymmetry - one of the most exciting and well-motivated streams in particle physics. In particular, it finds a very large enhancement of multiple Higgs boson production in vector-boson scattering when Higgs couplings to gauge bosons differ from those predicted by the Standard Model. The thesis demonstrates that due to the loss of (...)
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  23.  18
    Quantum-First Gravity.Steven B. Giddings - 2019 - Foundations of Physics 49 (3):177-190.
    This paper elaborates on an intrinsically quantum approach to gravity, which begins with a general framework for quantum mechanics and then seeks to identify additional mathematical structure on Hilbert space that is responsible for gravity and other phenomena. A key principle in this approach is that of correspondence: this structure should reproduce spacetime, general relativity, and quantum field theory in a limit of weak gravitational fields. A central question is that of “Einstein separability,” and asks how to define mutually independent (...)
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  24.  28
    Losing Stuff Down a Black Hole.Elias Okon & Daniel Sudarsky - 2018 - Foundations of Physics 48 (4):411-428.
    Over the years, the so-called black hole information loss paradox has generated an amazingly diverse set of proposals. However, 40 years after the introduction of Hawking’s radiation, there continues to be a debate regarding whether the effect does, in fact, lead to an actual problem. In this paper we try to clarify some aspect of the discussion by describing two possible perspectives regarding the landscape of the information loss issue. Moreover, we advance a fairly conservative point of view regarding the (...)
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  25.  21
    Humans on Top, Humans among the Other Animals: Narratives of Anthropological Difference.Filip Jaroš & Timo Maran - 2019 - Biosemiotics 12 (3):381-403.
    The relationship of humans to other primates – both in terms of abilities and evolution - has been an age-old topic of dispute in science. In this paper the claim is made that the different views of authors are based not so much on differences in empirical evidence, but on the ontological stances of the authors and the underlying ground narratives that they use. For comparing and reconciling the views presented by the representatives of, inter alia, cognitive ethology, comparative psychology, (...)
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  26.  11
    Humans on Top, Humans among the Other Animals: Narratives of Anthropological Difference.Filip Jaroš & Timo Maran - 2019 - Biosemiotics 12 (3):381-403.
    The relationship of humans to other primates – both in terms of abilities and evolution - has been an age-old topic of dispute in science. In this paper the claim is made that the different views of authors are based not so much on differences in empirical evidence, but on the ontological stances of the authors and the underlying ground narratives that they use. For comparing and reconciling the views presented by the representatives of, inter alia, cognitive ethology, comparative psychology, (...)
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  27.  21
    Humans on Top, Humans among the Other Animals: Narratives of Anthropological Difference.Filip Jaroš & Timo Maran - 2019 - Biosemiotics 12 (3):381-403.
    The relationship of humans to other primates – both in terms of abilities and evolution - has been an age-old topic of dispute in science. In this paper the claim is made that the different views of authors are based not so much on differences in empirical evidence, but on the ontological stances of the authors and the underlying ground narratives that they use. For comparing and reconciling the views presented by the representatives of, inter alia, cognitive ethology, comparative psychology, (...)
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  28.  27
    A first-order equation for spin in a manifestly relativistically covariant quantum theory.A. Arensburg & L. P. Horwitz - 1992 - Foundations of Physics 22 (8):1025-1039.
    Relativistic quantum mechanics has been formulated as a theory of the evolution ofevents in spacetime; the wave functions are square-integrable functions on the four-dimensional spacetime, parametrized by a universal invariant world time τ. The representation of states with spin is induced with a little group that is the subgroup of O(3, 1) leaving invariant a timelike vector nμ; a positive definite invariant scalar product, for which matrix elements of tensor operators are covariant, emerges from this construction. In a previous study (...)
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  29. Quantum-information conservation. The problem about “hidden variables”, or the “conservation of energy conservation” in quantum mechanics: A historical lesson for future discoveries.Vasil Penchev - 2020 - Energy Engineering (Energy) eJournal (Elsevier: SSRN) 3 (78):1-27.
    The explicit history of the “hidden variables” problem is well-known and established. The main events of its chronology are traced. An implicit context of that history is suggested. It links the problem with the “conservation of energy conservation” in quantum mechanics. Bohr, Kramers, and Slaters (1924) admitted its violation being due to the “fourth Heisenberg uncertainty”, that of energy in relation to time. Wolfgang Pauli rejected the conjecture and even forecast the existence of a new and unknown then elementary particle, (...)
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  30.  83
    Relational Physics with Real Rods and Clocks and the Measurement Problem of Quantum Mechanics.Rodolfo Gambini & Jorge Pullin - 2007 - Foundations of Physics 37 (7):1074-1092.
    The use of real clocks and measuring rods in quantum mechanics implies a natural loss of unitarity in the description of the theory. We briefly review this point and then discuss the implications it has for the measurement problem in quantum mechanics. The intrinsic loss of coherence allows to circumvent some of the usual objections to the measurement process as due to environmental decoherence.
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  31.  35
    The Firewall Transformation for Black Holes and Some of Its Implications.Gerard ’T. Hooft - 2017 - Foundations of Physics 47 (12):1503-1542.
    A promising strategy for better understanding space and time at the Planck scale, is outlined and further pursued. It is explained in detail, how black hole unitarity demands the existence of transformations that can remove firewalls. This must then be combined with a continuity condition on the horizon, with antipodal identification as an inevitable consequence. The antipodal identification comes with a \ inversion. We claim to have arrived at ‘new physics’, but rather than string theory, our ‘new physics’ concerns (...)
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  32. The correspondence principle in quantum field theory and quantum gravity.Damiano Anselmi - manuscript
    We discuss the fate of the correspondence principle beyond quantum mechanics, specifically in quantum field theory and quantum gravity, in connection with the intrinsic limitations of the human ability to observe the external world. We conclude that the best correspondence principle is made of unitarity, locality, proper renormalizability (a refinement of strict renormalizability), combined with fundamental local symmetries and the requirement of having a finite number of fields. Quantum gravity is identified in an essentially unique way. The gauge interactions (...)
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  33. Fakeons, quantum gravity and the correspondence principle.Damiano Anselmi - manuscript
    The correspondence principle made of unitarity, locality and renormalizability has been very successful in quantum field theory. Among the other things, it helped us build the standard model. However, it also showed important limitations. For example, it failed to restrict the gauge group and the matter sector in a powerful way. After discussing its effectiveness, we upgrade it to make room for quantum gravity. The unitarity assumption is better understood, since it allows for the presence of physical particles (...)
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  34. This Year's Nobel Prize (2022) in Physics for Entanglement and Quantum Information: the New Revolution in Quantum Mechanics and Science.Vasil Penchev - 2023 - Philosophy of Science eJournal (Elsevier: SSRN) 18 (33):1-68.
    The paper discusses this year’s Nobel Prize in physics for experiments of entanglement “establishing the violation of Bell inequalities and pioneering quantum information science” in a much wider, including philosophical context legitimizing by the authority of the Nobel Prize a new scientific area out of “classical” quantum mechanics relevant to Pauli’s “particle” paradigm of energy conservation and thus to the Standard model obeying it. One justifies the eventual future theory of quantum gravitation as belonging to the newly established quantum information (...)
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  35. Logic, mathematics, physics: from a loose thread to the close link: Or what gravity is for both logic and mathematics rather than only for physics.Vasil Penchev - 2023 - Astrophysics, Cosmology and Gravitation Ejournal 2 (52):1-82.
    Gravitation is interpreted to be an “ontomathematical” force or interaction rather than an only physical one. That approach restores Newton’s original design of universal gravitation in the framework of “The Mathematical Principles of Natural Philosophy”, which allows for Einstein’s special and general relativity to be also reinterpreted ontomathematically. The entanglement theory of quantum gravitation is inherently involved also ontomathematically by virtue of the consideration of the qubit Hilbert space after entanglement as the Fourier counterpart of pseudo-Riemannian space. Gravitation can be (...)
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  36.  6
    History as a Real Process: Historical Science and Philosophy of History.Ю.И Семенов - 2016 - Epistemology and Philosophy of Science 47 (1):50-56.
    In this article author considers the problem of epistemology of historical knowledge. Author doesn't accept the neo-kantianism theory. He makes an attempt to differ the two forms of unitarization of scientific knowledge — theoretization and the principle of holism and, hence, the two forms of the theoretical consideration of history. The author insists that the Marxists approach seems to be the most relevant from this point of view. Thus, he defends the thesis that the idealistic concepts are much vulnerable comparing (...)
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  37.  16
    Unitary Interactions Do Not Yield Outcomes: Attempting to Model “Wigner’s Friend”.Ruth Kastner - 2021 - Foundations of Physics 51 (4):1-12.
    An experiment by Proietti et al. purporting to instantiate the ‘Wigner’s Friend’ thought experiment is discussed. It is pointed out that the stated implications of the experiment regarding the alleged irreconcilability of facts attributed to different observers warrant critical review. In particular, violation of a Clauser–Horne–Shimony inequality by the experimental data actually shows that the attribution of measurement outcomes to the “Friends” is erroneous. An elementary but often overlooked result regarding improper mixtures is adduced in support of this assessment, and (...)
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  38.  20
    Ockham über die Seele und ihre Teile.Dominik Perler - 2010 - Recherches de Theologie Et Philosophie Medievales 77 (2):329-366.
    Ockham affirms that a human being consists of three really distinct forms that exist in matter, thus defending a «pluralist» position in the debate about the soul. However, he takes a «unitarist» position with regard to the rational soul, claiming that intellect and will are not really distinct. Why does he not admit a plurality of forms in the rational soul as well? And why does he think that the rational soul as a whole is really distinct from the sensory (...)
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  39.  35
    Particles vs. events: The concatenated structure of world lines in relativistic quantum mechanics. [REVIEW]R. Arshansky, L. P. Horwitz & Y. Lavie - 1983 - Foundations of Physics 13 (12):1167-1194.
    The dynamical equations of relativistic quantum mechanics prescribe the motion of wave packets for sets of events which trace out the world lines of the interacting particles. Electromagnetic theory suggests thatparticle world line densities be constructed from concatenation of event wave packets. These sequences are realized in terms of conserved probability currents. We show that these conserved currents provide a consistent particle and antiparticle interpretation for the asymptotic states in scattering processes. The relation between current conservation and unitarity is (...)
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  40.  32
    Is the light velocity in vacuum really a constant? Possible breakdown of the linear ω-k relation at extremely high frequencies.Kunio Fujiwara - 1980 - Foundations of Physics 10 (3-4):309-331.
    We investigate the novel problem of what happens in special relativity and in relativistic field theories whenthree-dimensional space is quantized. First we examine the equation for elastic waves on a linear chain, the simplest example of a quantized medium, and propose, on its analogy, a nonlinearp-k relationp=ħk(sinhkl)/kl for light and material waves. Here,kl is a new variable which represents the space-quantization effect on the plane wave of wave numberk=|k|. (Note thatkl=0 givesp=ħk.) This relation makes the light velocity in vacuum dependent (...)
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  41.  36
    Direct and Indirect Searches for Low-Mass Magnetic Monopoles.Leonard Gamberg, George R. Kalbfleisch & Kimball A. Milton - 2000 - Foundations of Physics 30 (4):543-565.
    Recently, there has been renewed interest in the search for low-mass magnetic monopoles. At the University of Oklahoma we are performing an experiment (Fermilab E882) using material from the old D0 and CDF detectors to set limits on the existence of Dirac monopoles of masses of the order of 500 GeV. To set such limits, estimates must be made of the production rate of such monopoles at the Tevatron collider, and of the binding strength of any such produced monopoles to (...)
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  42.  10
    Ockham about the soul and its parts.Dominik Perler - 2010 - Recherches de Theologie Et Philosophie Medievales 77 (2):313-350.
    Ockham affirms that a human being consists of three really distinct forms that exist in matter, thus defending a «pluralist» position in the debate about the soul. However, he takes a «unitarist» position with regard to the rational soul, claiming that intellect and will are not really distinct. Why does he not admit a plurality of forms in the rational soul as well? And why does he think that the rational soul as a whole is really distinct from the sensory (...)
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  43.  45
    Vertex Operators in 4D Quantum Gravity Formulated as CFT.Ken-ji Hamada - 2011 - Foundations of Physics 41 (5):863-882.
    We study vertex operators in 4D conformal field theory derived from quantized gravity, whose dynamics is governed by the Wess-Zumino action by Riegert and the Weyl action. Conformal symmetry is equal to diffeomorphism symmetry in the ultraviolet limit, which mixes positive-metric and negative-metric modes of the gravitational field and thus these modes cannot be treated separately in physical operators. In this paper, we construct gravitational vertex operators such as the Ricci scalar, defined as space-time volume integrals of them are invariant (...)
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  44.  65
    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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