The Experts below are selected from a list of 267 Experts worldwide ranked by ideXlab platform
Douglas Singleton - One of the best experts on this subject based on the ideXlab platform.
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Dirac and non-Dirac conditions in the two-potential theory of Magnetic Charge
The European Physical Journal C, 2018Co-Authors: John Scott, Douglas Singleton, Timothy J. Evans, Vladimir Dzhunushaliev, Vladimir FolomeevAbstract:We investigate the Cabbibo–Ferrari, two-potential approach to Magnetic Charge coupled to two different complex scalar fields, $$\Phi _1$$ and $$\Phi _2$$ , each having different electric and Magnetic Charges. The scalar field, $$\Phi _1$$ , is assumed to have a spontaneous symmetry breaking self-interaction potential which gives a mass to the “Magnetic” gauge potential and “Magnetic” photon, while the other “electric” gauge potential and “electric” photon remain massless. The Magnetic photon is hidden until one reaches energies of the order of the Magnetic photon rest mass. The second scalar field, $$\Phi _2$$ , is required in order to make the theory non-trivial. With only one field one can always use a duality rotation to rotate away either the electric or Magnetic Charge, and thus decouple either the associated electric or Magnetic photon. In analyzing this system of two scalar fields in the Cabbibo–Ferrari approach we perform several duality and gauge transformations, which require introducing non-Dirac conditions on the initial electric and Magnetic Charges. We also find that due to the symmetry breaking the usual Dirac condition is altered to include the mass of the Magnetic photon. We discuss the implications of these various conditions on the Charges.
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Magnetic Charge and Photon Mass: Physical String Singularities, Dirac Condition, and Magnetic Confinement
International Journal of Modern Physics A, 2018Co-Authors: Timothy J. Evans, Douglas SingletonAbstract:We find exact, simple solutions to the Proca version of Maxwell's equations with Magnetic sources. Several properties of these solutions differ from the usual case of Magnetic Charge with a massless photon: (i) the string singularities of the usual 3-vector potentials become real singularities in the Magnetic fields; (ii) the different 3-vector potentials become gauge inequivalent and physically distinct solutions; (iii) the Magnetic field depends on $r$ and $\theta$ and thus is no longer rotationally symmetric; (iv) a combined system of electric and Magnetic Charge carries a field angular momentum even when the electric and Magnetic Charges are located at the same place i.e. for dyons); (v) for these dyons one recovers the standard Dirac condition despite the photon being massive. We discuss the reason for this. We conclude by proposing that the string singularity in the Magnetic field of an {\it isolated} Magnetic Charge suggests a confinement mechanism for Magnetic Charge, similar to the flux tube confinement of quarks in QCD.
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Magnetic Charge and Photon Mass: Field String Singularities, Modified Dirac Condition, and Magnetic Confinement
2017Co-Authors: Timothy J. Evans, Douglas SingletonAbstract:We find exact, simple solutions to the Proca version of Maxwell's equations with Magnetic sources. Several properties of these solutions differ from the usual case of Magnetic Charge with a massless photon: (i) the string singularities of the usual 3-vector potentials become real singularities in the Magnetic fields; (ii) the different 3-vector potentials become gauge inequivalent and physically distinct solutions; (iii) the Magnetic field depends on $r$ and $\theta$ and thus is no longer rotationally symmetric; (iv) a combined system of electric and Magnetic Charge carries a field angular momentum even when the electric and Magnetic Charges are located at the same place i.e. for dyons); (v) for these dyons one recovers the standard Dirac condition despite the photon being massive. We discuss the reason for this. We conclude by proposing that the string singularity in the Magnetic field of an {\it isolated} Magnetic Charge suggests a confinement mechanism for Magnetic Charge, similar to the flux tube confinement of quarks in QCD.
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Can Magnetic Charge and Quantum Mechanics Co-exist ?
arXiv: High Energy Physics - Theory, 1997Co-Authors: Douglas SingletonAbstract:It is proven that if more than a single Magnetic Charge exists it is impossible to define a proper quantum mechanical angular momentum operator for an electrically Charged particle in the field of the Magnetic Charges. Assuming that quantum mechanics is correct we conclude that free Magnetic Charges (i.e. Magnetic Charges with a Coulomb-like Magnetic field) can not exist. The only apparent way to avoid this conclusion is if Magnetic Charges do exist, they must be permanently confined in monopole anti-monopole pairs, much in the same way quarks are thought to be confined.
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Restrictions on Magnetic Charge from Quantized Angular Momentum
1997Co-Authors: Douglas SingletonAbstract:Using the result that an electric Charge - Magnetic Charge system carries an internal field angular momentum of eg/4� we arrive at two restrictions on Magnetic monopoles via the requirement of angular momentum quantization and/or conservation. First we show that Magnetic Charge should scale in the opposite way from electric Charge. Second we show that free, unconfined monopoles seem to be inconsistent with quantized angular momentum when one considers a Magnetic Charge in the vicinity of more than one electric Charge.
Yasuhiro Nakazawa - One of the best experts on this subject based on the ideXlab platform.
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A new Ni(dmit)2-based organic Magnetic Charge-transfer salt, (m-PO-CONH- N-methylpyridinium)[Ni(dmit)2]·CH3CN
Inorganica Chimica Acta, 2018Co-Authors: Hiroki Akutsu, Soichi Ito, Tomofumi Kadoya, Jun-ichi Yamada, Shin'ichi Nakatsuji, Scott S. Turner, Yasuhiro NakazawaAbstract:Abstract A new Ni(dmit)2-based organic Magnetic Charge-transfer (CT) salt, (m-PO-CONH-N-methylpyridinium)[Ni(dmit)2]·CH3CN, where PO = 2,2,5,5-Tetramethyl-3-pyrrolin-1-oxyl free radical and dmit = 2-Thioxo-1,3-dithiole-4,5-dithiolate, was obtained, the crystal structure and Magnetic properties of which are reported. Magnetic susceptibility of the CT salt obeys a combination of 1D ferroMagnetic (1DF) Heisenberg (J1DF = +0.26 K) and Singlet-Triplet (ST) models (JST = −51.2 K) with mean field (MF) approximation (JMF = −6.7 K), suggesting that spins on the PO radicals form 1D ferroMagnetic chains and spins on the Ni(dmit)2 monoanions form spin dimers at low temperature, the latter of which was also confirmed by band calculations.
Yimei Zhu - One of the best experts on this subject based on the ideXlab platform.
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propagation of Magnetic Charge monopoles and dirac flux strings in an artificial spin ice lattice
Physical Review B, 2012Co-Authors: Shawn D Pollard, Vyacheslav Volkov, Yimei ZhuAbstract:We systematically investigate Magnetic reversal of permalloy islands in a square spin-ice geometry with in situ Lorentz microscopy. Differential phase imaging reveals the presence of a flux channel similar to a Dirac string between the Magnetic Charge monopoles during the reversal. Analysis of the phase images shows that positively and negatively Charged monopoles always move together with the flux channel. Statistical analysis of monopole populations and system correlations shows the emergence of a highly frustrated state for low magnetizations. This state is explained by a strong influence of Charge ordering, which limits monopole densities.
Hiroki Akutsu - One of the best experts on this subject based on the ideXlab platform.
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A new Ni(dmit)2-based organic Magnetic Charge-transfer salt, (m-PO-CONH- N-methylpyridinium)[Ni(dmit)2]·CH3CN
Inorganica Chimica Acta, 2018Co-Authors: Hiroki Akutsu, Soichi Ito, Tomofumi Kadoya, Jun-ichi Yamada, Shin'ichi Nakatsuji, Scott S. Turner, Yasuhiro NakazawaAbstract:Abstract A new Ni(dmit)2-based organic Magnetic Charge-transfer (CT) salt, (m-PO-CONH-N-methylpyridinium)[Ni(dmit)2]·CH3CN, where PO = 2,2,5,5-Tetramethyl-3-pyrrolin-1-oxyl free radical and dmit = 2-Thioxo-1,3-dithiole-4,5-dithiolate, was obtained, the crystal structure and Magnetic properties of which are reported. Magnetic susceptibility of the CT salt obeys a combination of 1D ferroMagnetic (1DF) Heisenberg (J1DF = +0.26 K) and Singlet-Triplet (ST) models (JST = −51.2 K) with mean field (MF) approximation (JMF = −6.7 K), suggesting that spins on the PO radicals form 1D ferroMagnetic chains and spins on the Ni(dmit)2 monoanions form spin dimers at low temperature, the latter of which was also confirmed by band calculations.
Girish C. Joshi - One of the best experts on this subject based on the ideXlab platform.
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Black holes with Magnetic Charge and quantized mass
arXiv: High Energy Physics - Phenomenology, 1998Co-Authors: A. Yu. Ignatiev, Girish C. Joshi, Kameshwar C. WaliAbstract:We examine the issue of Magnetic Charge quantization in the presence of black holes. It is pointed out that quantization of Magnetic Charge can lead to the mass quantization for Magnetically Charged black holes. We also discuss some implications for the experimental searches of Magnetically Charged black holes.
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Magnetic Charge in a Nonassociative Field Theory
Physics Letters B, 1997Co-Authors: C.c. Lassig, Girish C. JoshiAbstract:The violation of the Jacobi identity by the presence of Magnetic Charge is accomodated by using an explicitly nonassociative theory of octonionic fields. It is found that the dynamics of this theory is simplified if the Lagrangian contains only dyonic Charges, but certain problems in the constrained quantisation remain. The extension of these concepts to string theory may however resolve these difficulties.
