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Bell’s “Theorem”: loopholes vs. conceptual flaws

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Aus der Zeitschrift Open Physics Band 15 Heft 1

Abstract

An historical overview and detailed explication of a critical analysis of what has become known as Bell’s Theorem to the effect that, it should be impossible to extend Quantum Theory with the addition of local, real variables so as to obtain a version free of the ambiguous and preternatural features of the currently accepted interpretations is presented. The central point on which this critical analysis, due originally to Edwin Jaynes, is that Bell incorrectly applied probabilistic formulas involving conditional probabilities. In addition, mathematical technicalities that have complicated the understanding of the logical or mathematical setting in which current theory and experimentation are embedded, are discussed. Finally, some historical speculations on the sociological environment, in particular misleading aspects, in which recent generations of physicists lived and worked are mentioned.

Keywords: Bell’s Theorem; Projection Hypothesis; entanglement; non-locality; irreality
PACS: 03.65.Ud; 03.65.Ta

1 Introduction

1.1 The issue of dispute

Frequently in human affairs, be they world wars or parlor games, the participants become so fixated on the tactics of the moment that fundamental strategic considerations are overlooked. This writer holds that this is exactly the current situation with regard to the theoretical and experimental study of the nature and consequences of Bell’s Theorem. What has become known as “closing loopholes in the experimental verification of Bell’s Theorem” is a systematic attack on aspects of the experiments due to possible ancillary technicalities of the experimental setups. It is thought that peculiarities pertaining to the experimental equipment, or overlooked physical effects, may introduce erroneous data supporting misleading conclusions. Very few of those concerned with the general validity of the experimental verification of Bell’s theorem also concern themselves with the more fundamental question: is the theorem itself, aside from practical laboratory realities and exotic hypothetical effects, as a statement within the ambit of Quantum Theory, valid? Is it self consistent? And, is it rationally related to entities in the natural world? In short, is Bell’s Theorem logically correct in its ideal form, ignoring practical subsidiary laboratory complications?

In principle, if any statement is conceptually false, then rigorous, logical analysis can identify the offending assumption or deduction in the reasoning chain taken in the attempt to “prove” the conclusion. In mathematics, this process is denoted disproving a theorem. This is a formal matter. Formal logic, however, provides a simpler means to indisputably reject a theorem: display a single counterexample.

Informally, it is likewise instinctively understood, in addition, that any statement or idea that is afflicted with a fatal error, frequently due to complexity or the nonavailability of essential information, can be seen nevertheless as false because some consequence of the statement or a derived idea which should be valid if the statement is true, is in fact invalid. Such a situation can obtain sometimes even when there is no obvious connection to a formal proof or disproof of the statement itself. These “secondary” or derivative falsehoods or inconsistencies can be called “clues.” Often there is no obvious connection of such clues to a formal statement, and, very often they are disregarded as irrelevant.

Now, the critical literature negating the consequences of Bell’s analysis, known as his “Theorem,”[1] to the best knowledge of this writer, contains three long-term schools of analysis criticizing the formal proofs of Bell’s Theorem, and in addition, many single publications proffer clues. The latter are mostly accidental discoveries made in investigations, not always of Bell’s Theorem itself, but of some phenomena used for many purposes only one of which is involved in a experimental proof of Bell’s Theorem. Some of these “clues ” may also be denoted by custom as “loopholes,” which can be distinguished from pure clues by their relevance, not to the core validity of “Bell’s Theorem,” but just to its empirical verification.

Herein a line of critical analysis of “Bell’s Theorem” based on the observation that Bell mistook the use of coincident probabilities, is described. Bell’s analysis deduced an inequality that he asserted must be respected by all local (i.e., conventionally causal: causes of all effects lie within the latter’s past light cone) and realistic (i.e., all material entities exist independent of human interventions or observations).

In addition, there are alternate lines of critical analysis, based on other central observations or propositions, e.g.: [2, 3].

1.2 Clues and counterexamples

The current state of the art regarding proofs of Bell’s Theorem is that experimental realizations of the structure of the inequalities deduced in abstract proofs of Bell’s analysis find that Bell’s inequality is violated for auspiciously chosen parameters. Then, since Bell’s analysis states in short that, without some contribution of irreality (wave function collapse induced by human observation) and/or nonlocality (superluminal interaction) the observed results, i.e., the inequality violation, could not have been obtained. This conclusion is meant to be a logical deduction, in other words, a necessary consequence for the validity of the assertions made to the effect that, “experiments prove Bell’s Theorem.” If it is not valid, then all results from empirical tests of Bell’s analysis are ambiguous, insofar as they may have a conventional explanation, i.e., the experimental ‘proofs’ as such fail to satisfy the proclaimed theoretical deductions.

However, there exist relatively numerous examples of classical phenomena manifestly lacking any hint of irreality or nonlocality violating the very same inequalities. These ‘counterexamples’ usually are based on some macroscopic, classical realization of the microscopic phenomena exploited for the experimental Bell-test experiments. Results from these experiments, to the degree practical, violate Bell inequalities numerically in exactly the way as do Bell verification experiments. As argued above, this should be impossible if Bell analysis is logically fault free. Again, in other words, the conclusion that a Bell Inequality cannot be violated without irreality or nonlocality is baseless.

Herein first, pioneering studies presenting examples of such nonquantum phenomena tending to disprove Bell’s core conclusion by means of counterexample are briefly reviewed. These include those by A. O. Barut & collaborators, Perdijon and Mizrahi and Moussa. Thereafter, the reasons these obviously classical models coincide with the otherwise considered “quantum result” is discussed.

2 The Vanguard

2.1 A. O. Barut & collaborators

In a series of papers beginning about 1984 A. O. Barut and various collaborators have advanced the contention that, for spin -1/2 particles the average from a classical model of an ensemble of similar particles, yields the same correlations as does Quantum Mechanics [4]. They based their analysis on the known fact that Quantum Mechanics addresses only the expectation values of measurable parameters while having nothing to say about individual measurements. This allows then for reasonable physical assumptions regarding individual systems, which they take to be that an ensemble of such entities with spin can have a random distribution of spin orientations over a sphere. These hypothetical inputs to the model imply that, for their model, the singlet state is not a representation of an individual entity with spin, but rather a formalized expression for calculating expectation values for a randomly oriented ensemble of such entities.

In 1986 Barut and his student M. Božic extended their study to the triplet state [5]; and Barut reported explicit examples of hidden variable renditions of Bell Inequality tests thereby claiming to have found a counterexample to the widely accepted assertion that Quantum Mechanics cannot accept such variables [6][2]

Finally, in 1991 Barut published a considerably streamlined analysis of his central assertion regarding spin [7]. Here spin of an entity is taken to be specified by a vector S(θ, φ) giving its direction in space so that the expectation of the correlation E(A, B) is then the average over the randomly distributed angles (θ, φ) for all the elements of the ensemble, namely:

E(A,B)=∫dθsin⁡(θ)dφSl(θ,φ)⋅aSr(θ,φ)⋅b∫(dθsin⁡(θ)dφSl(θ,φ)⋅a)2(dθsin⁡(θ)dφSr(θ,φ)⋅a)2,=−a⋅b,

where a and b are the orientations of the magnetic field interacting with spin, or the axes of polarizers filtering light pulses. Insofar as this classical result is identical to the quantum version, Barut’s model constitutes a counterexample to claims that the observed correlations can be obtained only under the effects of either or both irreality and nonlocality.

2.2 Mizrahi and Moussa

These authors independently extended the analysis of the basic Bell-test by means of a simulation of the classical rendition of the experiment [8]. They proposed an actual mechanical and optical setup to realize the conditions envisioned for the basic, two wing Bell Inequality test. It consists of a randomly flashing light in a rotating tube the ends of which are equipped with two polarizer filters oriented such that their axes have a fixed angular displacement. The light pulses from the flashes then exit the tube on both sides and pass through polarizer filters with axes a, b fixed in the laboratory frame after which pulse intensity is measured and recorded for each. The randomness of the flashes with respect to the rotation of the tube ensures that the polarization orientation of any single pulse is random. The fixed displacement of the axes of the polarizers mounted on the end of the tube ensures that the relationship between the polarization axes of the two pulses is nevertheless fixed. This structure constitutes the essence of the natural phenomena under study. (See Figure 1.)

Figure 1 Schematic of a proposed simulation of the classical variant of the simplest Bell test experiment. The logic of Bell’s inequality derivation would predict that for this setup the inequality would be satisfied. In fact, however, numerical results parallel those from “quantum,” single-photon versions of this setup. Thus, it constitutes a counterexample for the claims made on the basis of Bell’s analysis.
Figure 1

Schematic of a proposed simulation of the classical variant of the simplest Bell test experiment. The logic of Bell’s inequality derivation would predict that for this setup the inequality would be satisfied. In fact, however, numerical results parallel those from “quantum,” single-photon versions of this setup. Thus, it constitutes a counterexample for the claims made on the basis of Bell’s analysis.

The laboratory setup to acquire the data for computing a Bell Inequality consists of two fixed polarizers with photodetectors, one set at each end with axis a or b. The photo detectors then register the intensity of the intensity of the macroscopic light pulses (obviously not single photons) which in the simulation are deduced according to Malus’ Law.

The simulation results are parallel to those obtained in actual optical realizations of the basic Bell-test. The fact that this manifestly classical arrangement leads to a violation of a Bell Inequality must mean either that classical optics also is irreal or nonlocal; or that the significance of Bell’s analysis is misinterpreted, even invalid.

3 The underlying defect

3.1 Edwin Jaynes

The models described above contradict the conclusion to Bell’s analysis. The natural question is: how can a seemingly rigorous deduction be challenged? What, if any, error is involved?

Historically, it seems that the otherworldly consequences of Bell’s analysis were in too great a conflict with otherwise intuitively logical, and without other exception, empirically verified principles to be accepted by everybody, so that in spite of sociological forces of conformity, some researchers sought non fantastical explanations. Perhaps the first to do so, or publish his opinion, was Edwin Jaynes. In the 1980’s Jaynes was engaged in an extensive study of Bayesian Methods within the whole of Physics, and was likely highly sensitized to the intricacies of probabilistic reasoning. With this competence he quickly spotted the fundamental mistake in Bell’s argumentation and made it an example of misapplication of probability theory in the preface to the proceedings of a conference held in 1988 on Bayesian Theory [9]. Therein, without any elaboration or even a single formula, he simply pointed out that Bell had misapplied the concept of a conditional probability. The missing elaboration was subsequently published by Perdijon in 1991.

3.2 Perdijon

In 1991 the French mining engineer J. Perdijon independently proposed the model described above but applied to the optical version concerning the relationship between different states of polarization [10]. His analysis is based clearly and explicitly on the observation that Bell’s expression for joint expectations, i.e.:

ρ(λ,a,b)=ρA(λ,a)ρB(λ,b),

silently presumes that the detections in the two output channels, i.e., “photon detections,” are statistically independent or uncorrelated—contrary to a fundamental, hypothetical input into the analysis. Perdijon notes that for correlated events this formula should be expressed by

ρ(λ,a,b)=ρA(λ,a|b)ρB(λ,b),

where ρA(λ,a|b) is the conditional probability that a detection is made at station A given that a detection was already made at station B. Such conditional probabilities do not imply, as mistakenly taken by Bell, that there is a causative interrelationship between the polarizers with settings a and b, but that the input signals differ in their characteristics as instilled at a “common cause” on the intersection of the past light cones of the signals[3] Thereafter, as the signals pass through detection stations, they are registered or “seen” if their characteristics correspond to the preset parameters set in the detection apparatus a,b. This is in accord with the conventional understanding of the application of probability theory to correlated events.

When this consideration for the most elementary optical version of experimental tests of Bell’s analysis is correctly taken into account, the derivation of a Bell Inequality does not go through. Thus, conclusions drawn from the empirical violation of a Bell Inequality are rendered invalid. These results can be extended straightforwardly to more complex coincidence experiments involving more than two channels [11, 12].

3.3 An explicit demonstration

The foundation of a Bell Inequality is the definition of a coincidence probability (or wave function) for correlated events. The version of this expression used by Bell is the following:

P(a,b)=∫dλρ(λ)A(a,λ)B(b,λ).(1)

Consider now the difference of two such coincident probabilities:

P(a,b)−P(a,b′)=∫dλρ(λ)[A(a,λ)B(b,λ)−A(a,λ)B(b′,λ)].(2)

Here, zero in the form:

0=∫dλρ(λ)[A(a,λ)B(b,λ)A(a′,λ)B(b′,λ)−A(a,λ)B(b′,λ)A(a′,λ)B(b,λ)],(3)

is added to Eq. (2) above, to get:

P(a,b)−P(a,b′)=∫dλρ(λ)[A(a,λ)B(b,λ)1+A(a′,λ)B(b′,λ)−∫dλρ(λ)[A(a,λ)B(b′,λ)1+A(a′,λ)B(b,λ).(4)

Then using |P| ≤ 1, one can write:

P(a,b)−P(a,b′)≤∫dλρ(λ)1+A(a′,λ)B(b′,λ)−∫dλρ(λ)1+A(a′,λ)B(b,λ),(5)

or

|P(a,b)−P(a,b′)|≤2−P(a′,b′)+P(a′,b),(6)

i.e.,

|P(a,b)−P(a,b′)|+|P(a′,b′)+P(a′,b)|≤2,(7)

which is one form of the celebrated “Bell inequalities.”

Now let us repeat these manipulations, however, starting from the explicit form of Eq. (1), namely:

P(a,b)=∫dλρ(λ)A(a|λ)B(b|a,λ).(8)

Again, the difference of two correlated probabilities:

P(a,b)−P(a,b′)=∫dλρ(λ)[A(a|λ,b)B(b,λ)−A(a|λ)B(b′|a,λ)](9)

and now a more explicit form for what should be an expression equaling zero:

0=∫dλρ(λ)[A(a|λ)B(b|a,λ)A(a′|λ)B(b′|a′,λ)−A(a,λ)B(b′|a′,λ)A(a′|λ)B(b|a,λ),(10)

giving:

P(a,b)−P(a,b′)=∫dλρ(λ)[A(a|λ)B(b|a,λ){1+A(a′|λ)B(b′|a′,λ)}−∫dλρ(λ)[A(a|λ)B(b′|a,λ){1+A(a′,λ)B(b|a,λ)};(11)

using, as above, |P| ≤ 1, gives:

P(a,b)−P(a,b′)≤∫dλρ(λ)[{1+A(a′|λ)B(b′|a′,λ)}]−∫dλρ(λ)[{1+A(a′|λ)B(b|a,λ)}].(12)

So, here we arrive at the crux of the matter insofar as Eq. (7) cannot follow because the term ∫ dλρ(λ)A(a′|λ)B(b|a,λ) does not equal P (a′, b). In fact it is undefined, or nonsense, as it is the product of the absolute probability A(a′|λ) times the conditional probability B(b|a, λ), which is not conditioned on a′, but on a, thereby rendering the product meaningless.

The final, general conclusion is that this Bell inequality is invalid; deductions from it are void[4]

Exceptionally, of course, when the two detections are uncorrelated, then B(b|a, λ) = B(b|a′, λ), and Bell’s result is valid.

4 Mathematical technicalities

4.1 Quantized and non quantized spaces

There is an intrinsic characteristic related to spin and electromagnetic polarization often overlooked but of fundamental significance. It is that, phenomena for which the mathematical rendition yields an orbital solution manifold with group structure captured by SU(2), are fundamentally non quantum. This follows inexorably from different viewpoints. One such is the fact that, SU(2) is homomorphic to SO(3), i.e., the group of rotations in longitude and latitude on a sphere. The non-commutativity of the generators of SO(3) obviously is geometric in nature. It has nothing to do with quantum mechanical structure, because it is not the consequence of Heisenberg Uncertainty. This is true even though factors of ħ appear, but where this factor scales the radius of the sphere upon which the displacements take place. SU(2) is the group of bi-vector transformations of the 2-D planes in 3-D space orthogonal to vectors (generators) associated with displacements in longitude and latitude. While it is less amenable to visualization than its homeomorph, it is clear that the non-commutative geometric structure of the planes or bi-vectors, like the great circle orbits on a spherical surface, is just a matter of geometry. Quantized spaces, where the non commutativity results from Heisenberg Uncertainty, comprise just two cases, namely phase space (q, p) and quadrature space (phase and amplitude of wave complexes, (ϕ, A)). An obvious consequence of these facts is that all experiments conducted on polarization of electromagnetic signals, (i.e., a structure first introduced by Stokes 70 years before Quantum Theory was envisioned, and having no relationship whatsoever to Heisenberg Uncertainty), cannot be employed for the exploration of implicit consequences from Quantum Mechanics.

This understanding of the fundamental character of this (topological) space, i.e., its non quantum status, is in full accord with all experimental realizations of investigations using Bell Inequalities to plumb Nature as revealed by Quantum Mechanics. In all optical experiments the a’s and b’s are experimenter chosen polarizer axes, which makes the whole setup sensible only if the λ’s are the polarization states of the photons (or electromagnetic pulses) passing through the measuring stations. This obviates the oft encountered theoretical discussion in which it is disputed whether the λ’s are correlated with the a’s and b’s. The whole point of measurement is to exploit a correlation between some property that is not accessible to human perception (because it is too small, outside the ambit of human perception, etc.), here λ, with some variable quantity that is accessible, a meter reading, say. In view of the fact that all the physical processes in the selected venue, i.e., that governed by SU(2), are non quantum in the first place thereby rendering all implications for the existence of preternatural “quantum” phenomena moot; the physical character of all involved variables as prequantum entities is determined by the relevant physics.

These mathematical considerations substantially reinforced by the fact that the instruments and devices employed in optical experiments are in fact capable only of making polarization determinations of electromagnetic pulses, whether such pulses correspond to single photons as imagined or not. The only means to introduce nonlocality or irreality is by hypothesizing that the polarization state of the pulses (photons) is determined by von Neumann’s “Projection” or collapse of the wave function upon observation, in this case by interaction with the polarizers in the measuring stations. However, there is no inexorable reason to reject the non quantum account of the relevant phenomena, specifically, prior causes.

4.2 Representative vice ontological states

Beyond the purely inadequate employ of formulas involving conditional probabilities implicit in this line of critical analysis of Bell’s Theorem, there is an ancillary issue introduced by the singlet state:

ψ=12|↑〉|→〉−|→〉|↑〉.

If this set of symbols is understood to represent a single, ontological entity, then it, as a composition of mutually exclusive components, is a logical abomination. Nevertheless, in the literature explicating Quantum Mechanics, it is often represented to pertain to a single system or entity. This combination of symbols, however, turns out to be coincidently vitally convenient. For the calculation of a coincidence coefficient as applicable to the experiment in Figure 1, i.e.:

E(a,b,α)=1N∑1NI(a)I(b)−1N∑1NI(a)1N∑1NI(b)1N∑1NI(a)2−1N∑1NI(a)21N∑1NI(ab)−1N∑1NI(b)2,

one sees from this formula that the data streams are to be normalized and have zero mean. In the quantum formalism, both the normalization and the zero mean are built into the definition of the singlet state, so that the calculation of the correlation coefficient conforms to the calculation of an expectation as prescribed by the Born interpretation of wave functions. Thus, in this respect and for that structure governed by SU(2), the quantum formalism merely redresses non quantum notation[5]

In any case, the identification of the expression for the singlet state (and many other similar “quantum” expressions) cannot irrefutably be associated with single ontological entities. Both theory and experiment pertain to ensembles of similar entities; in the case of particles with spin, for example, the ensemble may be distributed randomly over the surface of a sphere.

5 Conclusions

All of the components of the critical analysis presented above are fundamental principles known to virtually any competent practitioner in optics. Thus, the question arises: just how can what has been called “... la plus grande mépris de l’histoire de la physique?” [15], persist over 50 years and become ensconced as professional dogma? The response draws on yet another feature of Quantum Theory of an equally mystical character: the “Projection Hypothesis,” according to which all material entities at their core before measurement are completely described by a wave function consisting of a “superposition” of multiple, mutually exclusive subsequent stages of which one is held to be precipitated ultimately by the act of observation. Although von Neumann is credited with this idea by virtue of having presented it in his book on the mathematical foundations of Quantum Theory, less rigorous discussions and disputations on the interpretation of Schrödinger’s wave functions involving similar notions can be found in historical records. In any case, Bell himself in all his presentations clearly considered that the wave function of the “entangled” daughter particles of two wing variations of envisioned tests were to be ‘realized (i.e., converted to observable or “real” non-entangled entities) by the act of measurement at the detection stations A and B. Nonlocality (superluminal intercourse of some sort) should occur, he took it, in accord with the von Neumann’s Projection Hypothesis applied to separated but formerly entangled subsystems, as a consequence of measurement (which implies intervention by sentient beings). “Projection” is considered to entail ‘realizing’ all space-like separated subsystems instantaneously even when only one is materially engaged, in this regard it violates Einstein’s Principle of Causality that no effect can have a cause outside its past light cone.

It was in trying to accommodate the Projection Hypothesis that induced Bell to the erroneous notion that Quantum Mechanics imposed some kind of instantaneous ’realization’ to an unambiguous state (rather than the superposition of mutually exclusive options) of the spin direction of individual electrons passing through a Stern-Gerlach setup. The fact is, however, probability theory, in particular the use of conditional probabilities correctly employed, has nothing to say about the origin of correlations. The mathematical structure itself would accommodate instantaneous, nonlocal phenomena, were they to exist, without alterations. The source of the issue is not one of Probability Theory, but strictly of interpreting Quantum Theory.

From commentary accompanying early research, one can get the impression that the Projection Hypothesis was introduced in order to accommodate the fact that wave functions, even though interpreted as probability densities, seem also to have physical substance as they are seen to diffract at physical slits. Strictly abstract expressions of knowledge (i.e., epistemological entities) do not also interact with concrete material (i.e. ontological entities). Nevertheless, wave functions for single entities cannot be taken as empirically verified; so that imputing individual (vice ensemble) physical identities to them is not fully justified either. In turn, this complexity led to the introduction of yet another “spooky” notion: complementarity. Here again, weirdness in not the objection, but logical contradiction[6]

Arguably the tolerance of, as well as the public appetite for, mystical or preternatural “scientific” theorizing is best explained perhaps by the Forman Thesis [17]. According to Forman’s historical analysis, the psychological consequence in the post war German Weimar Republic, where the center of the development of Quantum Mechanics took place, as a result of the unexpected and sudden loss of WWI, was such as to foster a general, widespread loss of confidence in rationality and sober consideration of life’s experiences. Nowadays, in retrospect, it seems that this thesis has great merit even when it cannot be taken as the predominant factor. At a minimum, it accounts for the psycho-social environment within which Bell’s generation of physicists (certainly its mentors) were educated, and possibly were also predisposed to “open minded” tolerance of ideas actually deserving deep skepticism.

In conclusion, the analysis presented herein supports the assertion that, Bell’s analysis does not support the contention that Quantum Theory cannot in principle be extended by means of additional local, real variables. Einstein’s life-long conviction that ultimately an interpretation of quantum theory free of the ambiguities he criticized up to his death is seen to be deserving of respect and taken as guidance for the continued development of the understanding of the material world [18].

References

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Received: 2017-9-7
Accepted: 2017-10-20
Published Online: 2017-12-29

© 2017 A. F. Kracklauer

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

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https://doi.org/10.1515/phys-2017-0088
Schlagwörter für diesen Artikel
Bell’s Theorem; Projection Hypothesis; entanglement; non-locality; irreality
Creative Commons
BY-NC-ND 4.0

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  181. Special Issue on Advances on Modelling of Flowing and Transport in Porous Media
  182. Simulating gas-water relative permeabilities for nanoscale porous media with interfacial effects
  183. Special Issue on Advances on Modelling of Flowing and Transport in Porous Media
  184. Simulation of counter-current imbibition in water-wet fractured reservoirs based on discrete-fracture model
  185. Special Issue on Advances on Modelling of Flowing and Transport in Porous Media
  186. Investigation effect of wettability and heterogeneity in water flooding and on microscopic residual oil distribution in tight sandstone cores with NMR technique
  187. Special Issue on Advances on Modelling of Flowing and Transport in Porous Media
  188. Analytical modeling of coupled flow and geomechanics for vertical fractured well in tight gas reservoirs
  189. Special Issue on Ever-New "Loopholes" in Bell’s Argument and Experimental Tests
  190. Special Issue: Ever New "Loopholes" in Bell’s Argument and Experimental Tests
  191. Special Issue on Ever-New "Loopholes" in Bell’s Argument and Experimental Tests
  192. The ultimate loophole in Bell’s theorem: The inequality is identically satisfied by data sets composed of ±1′s assuming merely that they exist
  193. Special Issue on Ever-New "Loopholes" in Bell’s Argument and Experimental Tests
  194. Erratum to: The ultimate loophole in Bell’s theorem: The inequality is identically satisfied by data sets composed of ±1′s assuming merely that they exist
  195. Special Issue on Ever-New "Loopholes" in Bell’s Argument and Experimental Tests
  196. Rhetoric, logic, and experiment in the quantum nonlocality debate
  197. Special Issue on Ever-New "Loopholes" in Bell’s Argument and Experimental Tests
  198. What If Quantum Theory Violates All Mathematics?
  199. Special Issue on Ever-New "Loopholes" in Bell’s Argument and Experimental Tests
  200. Relativity, anomalies and objectivity loophole in recent tests of local realism
  201. Special Issue on Ever-New "Loopholes" in Bell’s Argument and Experimental Tests
  202. The photon identification loophole in EPRB experiments: computer models with single-wing selection
  203. Special Issue on Ever-New "Loopholes" in Bell’s Argument and Experimental Tests
  204. Bohr against Bell: complementarity versus nonlocality
  205. Special Issue on Ever-New "Loopholes" in Bell’s Argument and Experimental Tests
  206. Is Einsteinian no-signalling violated in Bell tests?
  207. Special Issue on Ever-New "Loopholes" in Bell’s Argument and Experimental Tests
  208. Bell’s “Theorem”: loopholes vs. conceptual flaws
  209. Special Issue on Ever-New "Loopholes" in Bell’s Argument and Experimental Tests
  210. Nonrecurrence and Bell-like inequalities
  211. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  212. Three-dimensional computer models of electrospinning systems
  213. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  214. Electric field computation and measurements in the electroporation of inhomogeneous samples
  215. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  216. Modelling of magnetostriction of transformer magnetic core for vibration analysis
  217. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  218. Comparison of the fractional power motor with cores made of various magnetic materials
  219. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  220. Dynamics of the line-start reluctance motor with rotor made of SMC material
  221. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  222. Inhomogeneous dielectrics: conformal mapping and finite-element models
  223. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  224. Topology optimization of induction heating model using sequential linear programming based on move limit with adaptive relaxation
  225. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  226. Detection of inter-turn short-circuit at start-up of induction machine based on torque analysis
  227. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  228. Current superimposition variable flux reluctance motor with 8 salient poles
  229. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  230. Modelling axial vibration in windings of power transformers
  231. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  232. Field analysis & eddy current losses calculation in five-phase tubular actuator
  233. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  234. Hybrid excited claw pole generator with skewed and non-skewed permanent magnets
  235. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  236. Electromagnetic phenomena analysis in brushless DC motor with speed control using PWM method
  237. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  238. Field-circuit analysis and measurements of a single-phase self-excited induction generator
  239. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  240. A comparative analysis between classical and modified approach of description of the electrical machine windings by means of T0 method
  241. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  242. Field-based optimal-design of an electric motor: a new sensitivity formulation
  243. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  244. Application of the parametric proper generalized decomposition to the frequency-dependent calculation of the impedance of an AC line with rectangular conductors
  245. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  246. Virtual reality as a new trend in mechanical and electrical engineering education
  247. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  248. Holonomicity analysis of electromechanical systems
  249. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  250. An accurate reactive power control study in virtual flux droop control
  251. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  252. Localized probability of improvement for kriging based multi-objective optimization
  253. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  254. Research of influence of open-winding faults on properties of brushless permanent magnets motor
  255. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  256. Optimal design of the rotor geometry of line-start permanent magnet synchronous motor using the bat algorithm
  257. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  258. Model of depositing layer on cylindrical surface produced by induction-assisted laser cladding process
  259. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  260. Detection of inter-turn faults in transformer winding using the capacitor discharge method
  261. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  262. A novel hybrid genetic algorithm for optimal design of IPM machines for electric vehicle
  263. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  264. Lamination effects on a 3D model of the magnetic core of power transformers
  265. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  266. Detection of vertical disparity in three-dimensional visualizations
  267. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  268. Calculations of magnetic field in dynamo sheets taking into account their texture
  269. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  270. 3-dimensional computer model of electrospinning multicapillary unit used for electrostatic field analysis
  271. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  272. Optimization of wearable microwave antenna with simplified electromagnetic model of the human body
  273. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  274. Induction heating process of ferromagnetic filled carbon nanotubes based on 3-D model
  275. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  276. Speed control of an induction motor by 6-switched 3-level inverter
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Heruntergeladen am 12.10.2025 von https://www.degruyterbrill.com/document/doi/10.1515/phys-2017-0088/html?licenseType=open-access
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