Results for 'superluminal'

93 found
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  1.  20
    Nonlocal Quantum Information Transfer Without Superluminal Signalling and Communication.Jan Walleczek & Gerhard Grössing - 2016 - Foundations of Physics 46 (9):1208-1228.
    It is a frequent assumption that—via superluminal information transfers—superluminal signals capable of enabling communication are necessarily exchanged in any quantum theory that posits hidden superluminal influences. However, does the presence of hidden superluminal influences automatically imply superluminal signalling and communication? The non-signalling theorem mediates the apparent conflict between quantum mechanics and the theory of special relativity. However, as a ‘no-go’ theorem there exist two opposing interpretations of the non-signalling constraint: foundational and operational. Concerning Bell’s theorem, (...)
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  2. Superluminal Signals and the Resolution of the Causal Paradox.F. Selleri - 2006 - Foundations of Physics 36 (3):443-463.
    The experimental evidence for electromagnetic signals propagating with superluminal group velocity is recalled. Transformations of space and time depending on a synchronization parameter, e1, indicate the existence of a privileged inertial system. The Lorentz transformations are obtained for a particular e1≠0. No standard experiment on relativity depends on e1, but if accelerations are considered only e1=0 remains possible. The causal paradox generated by superluminal signals (SLS) in the theory of relativity does not exist in the theory with e1=0. (...)
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  3.  25
    On Superluminal Particles and the Extended Relativity Theories.Carlos Castro - 2012 - Foundations of Physics 42 (9):1135-1152.
    Superluminal particles are studied within the framework of the Extended Relativity theory in Clifford spaces (C-spaces). In the simplest scenario, it is found that it is the contribution of the Clifford scalar component π of the poly-vector-valued momentum which is responsible for the superluminal behavior in ordinary spacetime due to the fact that the effective mass $\mathcal{M} = \sqrt{ M^{2} - \pi^{2} }$ is imaginary (tachyonic). However, from the point of view of C-space, there is no superluminal (...)
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  4.  45
    Superluminal Signal Velocity and Causality.Günter Nimtz - 2004 - Foundations of Physics 34 (12):1889-1903.
    A superluminal signal velocity (i.e. faster than light) is said to violate causality. However, superluminal signal velocities have been measured in tunneling experiments recently. The classical dipole interaction approach by Sommerfeld and Brillouin results in a complex refractive index with a finite real part. For the tunneling process with its purely imaginary refractive index this model obtaines a zero-time traversing of tunneling barriers in agreement with wave meechanics. The information of a signal is proportional to the product of (...)
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  5. The Standard Model's Form Derived From Operator Logic, Superluminal Transformations and Gl(16).Stephen Blaha - 2010 - Pingree-Hill.
  6.  40
    No Superluminal Propagation for Classical Relativistic and Relativistic Quantum Fields.John Earman - 2014 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 48 (2):102-108.
    A criterion is proposed to ensure that classical relativistic fields do not propagate superluminally. If this criterion does indeed serve as a sufficient condition for no superluminal propagation it follows that various other criteria found in the physics literature cannot serve as necessary conditions since they can fail although the proffered condition holds. The rejected criteria rely on energy conditions that are believed to hold for most classical fields used in actual applications. But these energy conditions are known to (...)
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  7. Superluminal Signaling and Relativity.Steven Weinstein - 2006 - Synthese 148 (2):381-399.
    Special relativity is said to prohibit faster-than-light (superluminal) signaling, yet controversy regularly arises as to whether this or that physical phenomenon violates the prohibition. I argue that the controversy is a result of a lack of clarity as to what it means to ‘signal’, and I propose a criterion. I show that according to this criterion, superluminal signaling is not prohibited by special relativity.
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  8.  95
    Quantum Collapse, Consciousness and Superluminal Communication.Shan Gao - 2004 - Foundations Of Physics Letters 17 (2):167-182.
    The relation between quantum collapse, consciousness and superluminal communication is analyzed. As we know, quantum collapse, if exists, can result in the appearance of quantum nonlocality, and requires the existence of a pre- ferred Lorentz frame. This may permit the realization of quantum superluminal communication (QSC), which will no longer result in the usual causal loop in case of the existence of a preferred Lorentz frame. The possibility of the existence of QSC is further analyzed under the assumption (...)
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  9. Aspects of Quantum Non-Locality I: Superluminal Signalling, Action-at-a-Distance, Non-Separability and Holism.Joseph Berkovitz - 1998 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 29 (2):183-222.
    In this paper and its sequel, I consider the significance of Jarrett’s and Shimony’s analyses of the so-called factorisability condition for clarifying the nature of quantum non-locality. In this paper, I focus on four types of non-locality: superluminal signalling, action-at-a-distance, non-separability and holism. In the second paper, I consider a fifth type of non-locality: superluminal causation according to ‘logically weak’ concepts of causation, where causal dependence requires neither action nor signalling. In this connection, I pay special attention to (...)
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  10. Aspects of Quantum Non-Locality II: Superluminal Causation and Relativity.Joseph Berkovitz - 1998 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 29 (4):509-545.
    In a preceding paper, I studied the significance of Jarrett's and Shimony's analyses of 'factorisability' into 'parameter independence' and 'outcome independence' for clarifying the nature of non-locality in quantum phenomena. I focused on four types of non-locality; superluminal signalling, action-at-a-distance, non-separability and holism. In this paper, I consider a fifth type of non-locality: superluminal causation according to 'logically weak' concepts of causation, where causal dependence requires neither action nor signalling. I conclude by considering the compatibility of non-factorisable theories (...)
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  11. Quantum Nonlocality and the Possibility of Superluminal Effects.John G. Cramer - unknown
    EPR experiments demonstrate that standard quantum mechanics exhibits the property of nonlocality , the enforcement of correlations between separated parts of an entangled quantum systems across spacelike separations. Nonlocality will be clarified using the transactional interpretation of quantum mechanics, and the possibility of superluminal effects (e.g., faster-than-light communication) from nonlocality and non-linear quantum mechanics will be examined.
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  12.  39
    Hidden Locality, Conspiracy and Superluminal Signals.Frederick M. Kronz - 1990 - Philosophy of Science 57 (3):420-444.
    This paper involves one crucial assumption; namely, that the statistical predictions of quantum mechanics for Bell's variant of the EPR experiment will continue to be verified as detector efficiencies are improved and the need for coincidence counters is eliminated. This assumption entails that any hidden-variables theory for quantum mechanics must violate Bell's inequality--the inequality derived in Bell (1964). It is shown here that four locality conditions are involved in the derivation of Bell's inequality; and that a violation of any of (...)
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  13.  8
    Aspects of Quantum Non-Locality I: Superluminal Signalling, Action-at-a-Distance, Non-Separability and Holism.Joseph Berkovitz - 1996 - Studies in History and Philosophy of Modern Physics 29 (2):183-222.
    In this paper and its sequel, I consider the significance of Jarrett’s and Shimony’s analyses of the so-called factorisability condition for clarifying the nature of quantum non-locality. In this paper, I focus on four types of non-locality: superluminal signalling, action-at-a-distance, non-separability and holism. In the second paper, I consider a fifth type of non-locality: superluminal causation according to ‘logically weak’ concepts of causation, where causal dependence requires neither action nor signalling. In this connection, I pay special attention to (...)
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  14.  27
    Against Dogma: On Superluminal Propagation in Classical Electromagnetism.James Owen Weatherall - 2014 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 48 (2):109-123.
    It is deeply entrenched dogma that relativity theory prohibits superluminal propagation. It is also experimentally well-established that under some circumstances, classical electromagnetic fields propagate through a dielectric medium with superluminal group velocities and superluminal phase velocities. But it is usually claimed that these superluminal velocities do not violate the relativistic prohibition. Here I analyze electromagnetic fields in a dielectric medium within a framework for understanding superluminal propagation recently developed by Geroch and elaborated by Earman. I (...)
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  15.  67
    Superluminal Motions? A Bird's-Eye View of the Experimental Situation.Erasmo Recami - 2001 - Foundations of Physics 31 (7):1119-1135.
    In this article, after a theoretical introduction and a sketch of some related long-standing predictions, a bird's-eye view is presented—with the help of nine figures—of the various experimental sectors of physics in which Superluminal motions seem to appear (thus contributing support to those past predictions). In particular, a panorama is presented of the experiments with evanescent waves and/or tunnelling photons, and with the “localized Superluminal solutions” to the Maxwell equations (like the so-called X-shaped beams). The present review is (...)
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  16.  6
    Would Superluminal Influences Violate the Principle of Relativity?Kent A. Peacock - 2014 - Lato Sensu, Revue de la Société de Philosophie des Sciences 1 (1).
    It continues to be alleged that superluminal in uences of any sort would be inconsistent with special relativity for the following three reasons: they would imply the existence of a ‘distinguished’ frame; they would allow the detection of absolute motion; and they would violate the relativity of simultaneity. This paper shows that the first two objections rest upon very elementary misunderstandings of Minkowski geometry and on lingering Newtonian intuitions about instantaneity. The third objection has a basis, but rather than (...)
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  17.  92
    Quantum Formalism with State-Collapse and Superluminal Communication.George Svetlichny - 1998 - Foundations of Physics 28 (2):131-155.
    Given the collapse hypothesis (CH) of quantum measurement, EPR-type correlations along with the hypothesis of the impossibility of superluminal communication (ISC) have the effect of globalizing gross features of the quantum formalism making them universally true. In particular, these hypotheses imply that state transformations of density matrices must be linear and that evolution which preserves purity of states must also be linear. A gedanken experiment shows that Lorentz covariance along with the second law of thermodynamics imply a nonentropic version (...)
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  18.  20
    On the Possibility of Nonlinear Quantum Evolution and Superluminal Communication.Shan Gao - unknown
    A possible mechanism of nonlinear quantum evolution is introduced and its implications for quantum communication are investigated. First, it is demonstrated that an appropriate combination of wavefunction collapse and the consciousness of observer may permit the observer to distinguish nonorthogonal quantum states in principle, and thus consciousness will introduce certain nonlinearity into quantum dynamics. Next, it is shown that the distinguishability of nonorthogonal states can be used to achieve quantum superluminal communication, by which information can be transmitted nonlocally and (...)
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  19.  21
    Possible Test of the Reality of Superluminal Phase Waves and Particle Phase Space Motions in the Einstein-de Broglie-Bohm Causal Stochastic Interpretation of Quantum Mechanics.J. P. Vigier - 1994 - Foundations of Physics 24 (1):61-83.
    Recent double-slit type neutron experiments (1) and their theoretical implications (2) suggest that, since one can tell through which slit the individual neutrons travel, coherent wave packets remain nonlocally coupled (with particles one by one), even in the case of wide spatial separation. Following de Broglie's initial proposal, (3) this property can be derived from the existence of the persisting action of real superluminal physical phase waves considered as building blocks of the real subluminal wave field packets which surround (...)
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  20.  30
    Is Superluminal Travel a Theoretical Possibility?N. T. Bishop - 1984 - Foundations of Physics 14 (4):333-340.
    The theory of relativity forbids the superluminal travel of ordinary matter. However, it is possible to amend the theory of relativity and to develop a theory permitting superluminal travel. The acceptability of the features needed for superluminal travel is discussed.
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  21.  28
    The Pitowsky Model and Superluminal Signals.Richard Jozsa - 1989 - Foundations of Physics 19 (11):1327-1335.
    A recent thought experiment to achieve superluminal signalling within the Pitowsky model is examined, and it is shown that such signalling is not possible. The analysis of the experiment is used to highlight the paradoxical nonphysical nature of Pitowsky's extended notion of probability.
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  22.  61
    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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  23.  21
    The Introduction of Superluminal Lorentz Transformations: A Revisitation. [REVIEW]G. D. Maccarrone & Erasmo Recami - 1984 - Foundations of Physics 14 (5):367-407.
    We revisit the introduction of the Superluminal Lorentz transformations which carry from “bradyonic” inertial frames to “tachyonic” inertial frames, i.e., which transform time-like objects into space-like objects, andvice versa. It has long been known that special relativity can be extended to Superluminal observers only by increasing the number of dimensions of the space-time or—which is in a sense equivalent—by releasing the reality condition (i.e., introducing also imaginary quantities). In the past we always adopted the latter procedure. Here we (...)
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  24.  13
    Superluminal Transformations in Complex Minkowski Spaces.Ceon Ramon & Elizabeth A. Rauscher - 1980 - Foundations of Physics 10 (7-8):661-669.
    We calculate the mixing of real and imaginary components of space and time under the influence of superluminal boosts in thex direction. A unique mixing is determined for this superluminal Lorentz transformation when we consider the symmetry properties afforded by the inclusion of three temporal directions. Superluminal transformations in complex six-dimensional space exhibit unique tachyonic connections which have both remote and local space-time event connections.
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  25.  12
    Superluminal Signalling.Steven Weinstein - unknown
    Special relativity is said to prohibit faster-than-light (superluminal) signalling, yet controversy regularly arises as to whether this or that physical phenomenon violates the prohibition. I argue that the controversy is a result of a lack of clarity as to what it means to `signal', and I propose a criterion. I show that although we have no reason to think that one can send signals faster than light, this is not prohibited by special relativity.
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  26.  7
    Reconciling Causality with Superluminal Travel.George H. Duffey - 1980 - Foundations of Physics 10 (11-12):959-964.
    A tachyon or a superluminal wave group appears as a spacelike structure through a region in the reference frame in which it is at rest. Such a structure can arise from residue left (a) by a particle or wave group traveling at fundamental speed c or less, or (b) in the creation or separation of particles. Thus, Maund's argument does not prove that tachyons cannot exist. Creation may include lepton-quark production as well as particle-antiparticle production.
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  27. Temporal Parts and Superluminal Motion.Yuri Balashov - 2003 - Philosophical Papers 32 (1):1-13.
    Hud Hudson has recently suggested a scenario intended to show that, assuming the doctrine of temporal parts and a sufficiently liberal view of composition, there are material objects that move faster than light. I accept Hudson's conditional but contend that his modus ponens is less plausible that the corresponding modus tollens. Reversed in this way, the argument stemming from the scenario raises the cost of mereological liberalism and advances the case for a principled restriction on diachronic composition.
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  28. A General Argument Against Superluminal Transmission Through the Quantum Mechanical Measurement Process.G. C. Ghirardi, A. Rimini & T. Weber - 1980 - Lettere Al Nuovo Cimento 27:294--298.
  29.  2
    The Existence of Superluminal Particles is Consistent with Relativistic Dynamics.Judit X. Madarász & Gergely Székely - 2014 - Journal of Applied Logic 12 (4):477-500.
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  30. FLASH—A Superluminal Communicator Based Upon a New Kind of Quantum Measurement.Nick Herbert - 1982 - Foundations of Physics 12 (12):1171-1179.
    The FLASH communicator consists of an apparatus which can distinguish between plane unpolarized (PUP) and circularly unpolarized (CUP) light plus a simple EPR arrangement. FLASH exploits the peculiar properties of “measurements of the Third Kind.” One purpose of this article is to focus attention on the operation of idealized laser gain tubes at the one-photon limit.
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  31. Strong Constraints on Models That Explain the Violation of Bell Inequalities with Hidden Superluminal Influences.Valerio Scarani, Jean-Daniel Bancal, Antoine Suarez & Nicolas Gisin - 2014 - Foundations of Physics 44 (5):523-531.
    We discuss models that attempt to provide an explanation for the violation of Bell inequalities at a distance in terms of hidden influences. These models reproduce the quantum correlations in most situations, but are restricted to produce local correlations in some configurations. The argument presented in (Bancal et al. Nat Phys 8:867, 2012) applies to all of these models, which can thus be proved to allow for faster-than-light communication. In other words, the signalling character of these models cannot remain hidden.
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  32.  61
    Are Prohibitions of Superluminal Causation by Stochastic Einstein Locality and by Absence of Lewisian Probabilistic Counterfactual Causality Equivalent?Miklos Redei - 1993 - Philosophy of Science 60 (4):608-618.
    Butterfield's (1992a,b,c) claim of the equivalence of absence of Lewisian probabilistic counterfactual causality (LC) to Hellman's stochastic Einstein locality (SEL) is questioned. Butterfield's assumption on which the proof of his claim is based would suffice to prove that SEL implies absence of LC also for appropriately given versions of these notions in algebraic quantum field theory, but the assumption is not an admissible one. The conclusion must be that the relation of SEL and absence of LC is open, and that (...)
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  33.  95
    Are Superluminal Connections Necessary? (')(-).H. P. Bmrp - unknown
    Summary. — The following theorem is proved.: If the statistical predictions of quantum theory are true in general and. if the macroscopic world is not radically different from what is observed, then what happens macroscopically in one space-time region must in some cases depend on variables that are controlled by experimenters in far-away, space-like-separated. regions. By what happens macroscopically in one space-time region is meant specifically the occurrence or nonoccurrence of a macroscopic event, such as the d.etection and recording of (...)
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  34.  43
    Reply to 'Comment on “Helmholtz Theorem and the V-Gauge in the Problem of Superluminal and Instantaneous Signals in Classical Electrodynamics” by A. Chubykalo Et Al.' by J.A. Heras [Found. Phys. Lett. Vol. 19(6) P. 579 (2006)]. [REVIEW]A. Chubykalo, A. Espinoza, R. Alvarado Flores & A. Gutierrez Rodriguez - 2007 - Foundations of Physics 37 (11):1648-1652.
  35.  25
    Jarrett Completeness and Superluminal Signals.Frederick M. Kronz - 1990 - PSA: Proceedings of the Biennial Meeting of the Philosophy of Science Association 1990:227-239.
    Jarrett has demonstrated that "strong locality," one of the conditions used by Bell to derive his well known inequality, is equivalent to the conjunction of two other conditions which he calls "hidden locality" and "completeness." He has also demonstrated that if it is possible to control the hidden states of the measured system, then violations of hidden locality can be used to transmit information superluminally; and that this is not so with respect to violations of completeness. This he has taken (...)
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  36.  10
    Tachyons and Superluminal Wave Groups.George H. Duffey - 1975 - Foundations of Physics 5 (2):349-354.
    In the approximation that every inertial observer experiences a homogeneous, uniform flow of time and sees a space that is Euclidean, the arena of physics is Minkowskian and one speed is the same in all intertial frames. If a given intertial observer finds an infinitesimal source or particle traveling faster than this fundamental speed near a given event, the source must appear in some inertial frame spread over neighboring positions at a given time as a spacelike structure. If this structure (...)
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  37.  2
    Is Superluminal Travel a Theoretical Possibility? II.N. T. Bishop - 1988 - Foundations of Physics 18 (5):571-574.
  38. Superluminal Signal Velocity and Causality.Nimtz Gunter - 2004 - Foundations of Physics 34 (12):1889-1903.
     
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  39.  18
    Reply to ‘Comment on “Helmholtz Theorem and the V-Gauge in the Problem of Superluminal and Instantaneous Signals in Classical Electrodynamics” by A. Chubykalo Et Al.’ by J.A. Heras [Found. Phys. Lett. Vol. 19 P. 579 ]. [REVIEW]Andrew Chubykalo, Augusto Espinoza, R. Alvarado Flores & A. Gutierrez Rodriguez - 2007 - Foundations of Physics 37 (11):1648-1652.
  40.  6
    Producing Superluminal Particles [9].J. J. Smulsky - 1997 - Apeiron 4:92-94.
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  41. Superluminal (but Causal) Effects in Quantum Physicsa.John C. Garrison - 1995 - In John Archibald Wheeler, Daniel M. Greenberger & Anton Zeilinger (eds.), Fundamental Problems in Quantum Theory: A Conference Held in Honor of Professor John A. Wheeler. New York Academy of Sciences.
     
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  42. Apparent Superluminal Jets as a Test of Special Relativity.C. Renshaw - 1996 - Apeiron 3 (2):46-49.
     
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  43.  82
    Experimental Repeal of the Speed Limit for Gravitational, Electrodynamic, and Quantum Field Interactions.Tom Van Flandern & Jean-Pierre Vigier - 2002 - Foundations of Physics 32 (7):1031-1068.
    General relativity has a geometric and a field interpretation. If angular momentum conservation is invoked in the geometric interpretation to explain experiments, the causality principle is violated. The field interpretation avoids this problem by allowing faster-than-light propagation of gravity in forward time. All existing experiments are in agreement with that interpretation. This implies the existence of real superluminal propagation and communication of particles and fields, free of causality problems. The introduction of real physical faster-than-light propagation into gravitation, electrodynamics and (...)
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  44.  75
    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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  45. Vor dem Starten ankommen. Über Zeitreisen und Warp-Antriebe.Kay Herrmann - 2016 - Universitätsverlag Chemnitz.
    Time travel and superluminal travel are two of mankind's dreams. They inspire our imagination and provide material for bizarre stories. -/- A work on the subject of time travel and superluminal travel forces us to re-examine our concept of "time". The complexity and the contradictory nature this subject makes it difficult to be more precise about "time". On its deepest subjective side, time is a means of perception, a biological rhythm, a social phenomenon in terms of our collective (...)
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  46.  35
    On Virtual Phonons, Photons, and Electrons.Günter Nimtz - 2009 - Foundations of Physics 39 (12):1346-1355.
    A macroscopic realization of the peculiar virtual particles is presented. The classical Helmholtz and the Schrödinger equations are differential equations of the same mathematical structure. The solutions with an imaginary wave number are called evanescent modes in the case of elastic and electromagnetic fields. In the case of non-relativistic quantum mechanical fields they are called tunneling solutions. The imaginary wave numbers point to strange consequences: The waves are non-local, they are not observable, and they are described as virtual particles. During (...)
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  47.  38
    Tunneling Confronts Special Relativity.Günter Nimtz - 2011 - Foundations of Physics 41 (7):1193-1199.
    Experiments with evanescent modes and tunneling particles have shown that (i) their signal velocity may be faster than light, (ii) they are described by virtual particles, (iii) they are nonlocal and act at a distance, (iv) experimental tunneling data of phonons, photons, and electrons display a universal scattering time at the tunneling barrier front, and (v) the properties of evanescent, i.e. tunneling modes are not compatible with the special theory of relativity.
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  48. Characterizing Quantum Theory in Terms of Information-Theoretic Constraints.Rob Clifton, Jeffrey Bub & Hans Halvorson - 2002 - Foundations of Physics 33 (11):1561-1591.
    We show that three fundamental information-theoretic constraints -- the impossibility of superluminal information transfer between two physical systems by performing measurements on one of them, the impossibility of broadcasting the information contained in an unknown physical state, and the impossibility of unconditionally secure bit commitment -- suffice to entail that the observables and state space of a physical theory are quantum-mechanical. We demonstrate the converse derivation in part, and consider the implications of alternative answers to a remaining open question (...)
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  49.  51
    The Metaphysics of Hyperspace.Hud Hudson - 2005 - Oxford University Press.
    Hud Hudson offers a fascinating examination of philosophical reasons to believe in hyperspace. He explores non-theistic reasons in the first chapter and theistic ones towards the end; in the intervening sections he inquires into a variety of puzzles in the metaphysics of material objects that are either generated by the hypothesis of hyperspace or else informed by it, with discussions of receptacles, boundaries, contact, occupation, and superluminal motion. Anyone engaged with contemporary metaphysics, and many philosophers of religion, will find (...)
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  50. Bell's Theorem: What It Takes.Jeremy Butterfield - 1992 - British Journal for the Philosophy of Science 43 (1):41-83.
    I compare deterministic and stochastic hidden variable models of the Bell experiment, exphasising philosophical distinctions between the various ways of combining conditionals and probabilities. I make four main claims. (1) Under natural assumptions, locality as it occurs in these models is equivalent to causal independence, as analysed (in the spirit of Lewis) in terms of probabilities and conditionals. (2) Stochastic models are indeed more general than deterministic ones. (3) For factorizable stochastic models, relativity's lack of superluminal causation does not (...)
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