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Artykuły w czasopismach na temat „Electrodynamical coupling”

Autor: Grafiati

Data publikacji: 6 września 2023

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1

Sentef, M. A., M. Ruggenthaler i A. Rubio. "Cavity quantum-electrodynamical polaritonically enhanced electron-phonon coupling and its influence on superconductivity". Science Advances 4, nr 11 (listopad 2018): eaau6969. http://dx.doi.org/10.1126/sciadv.aau6969.

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So far, laser control of solids has been mainly discussed in the context of strong classical nonlinear light-matter coupling in a pump-probe framework. Here, we propose a quantum-electrodynamical setting to address the coupling of a low-dimensional quantum material to quantized electromagnetic fields in quantum cavities. Using a protoypical model system describing FeSe/SrTiO3with electron-phonon long-range forward scattering, we study how the formation of phonon polaritons at the two-dimensional interface of the material modifies effective couplings and superconducting properties in a Migdal-Eliashberg simulation. We find that through highly polarizable dipolar phonons, large cavity-enhanced electron-phonon couplings are possible, but superconductivity is not enhanced for the forward-scattering pairing mechanism due to the interplay between coupling enhancement and mode softening. Our results demonstrate that quantum cavities enable the engineering of fundamental couplings in solids, paving the way for unprecedented control of material properties.

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Singh, A. K., Devendraa Siingh, R. P. Singh i Sandhya Mishra. "Electrodynamical Coupling of Earth's Atmosphere and Ionosphere: An Overview". International Journal of Geophysics 2011 (2011): 1–13. http://dx.doi.org/10.1155/2011/971302.

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Electrical processes occurring in the atmosphere couple the atmosphere and ionosphere, because both DC and AC effects operate at the speed of light. The electrostatic and electromagnetic field changes in global electric circuit arise from thunderstorm, lightning discharges, and optical emissions in the mesosphere. The precipitation of magnetospheric electrons affects higher latitudes. The radioactive elements emitted during the earthquakes affect electron density and conductivity in the lower atmosphere. In the present paper, we have briefly reviewed our present understanding of how these events play a key role in energy transfer from the lower atmosphere to the ionosphere, which ultimately results in the Earth's atmosphere-ionosphere coupling.

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3

Onohara, A. N., I. S. Batista i H. Takahashi. "The ultra-fast Kelvin waves in the equatorial ionosphere: observations and modeling". Annales Geophysicae 31, nr 2 (7.02.2013): 209–15. http://dx.doi.org/10.5194/angeo-31-209-2013.

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Abstract. The main purpose of this study is to investigate the vertical coupling between the mesosphere and lower thermosphere (MLT) region and the ionosphere through ultra-fast Kelvin (UFK) waves in the equatorial atmosphere. The effect of UFK waves on the ionospheric parameters was estimated using an ionospheric model which calculates electrostatic potential in the E-region and solves coupled electrodynamics of the equatorial ionosphere in the E- and F-regions. The UFK wave was observed in the South American equatorial region during February–March 2005. The MLT wind data obtained by meteor radar at São João do Cariri (7.5° S, 37.5° W) and ionospheric F-layer bottom height (h'F) observed by ionosonde at Fortaleza (3.9° S; 38.4° W) were used in order to calculate the wave characteristics and amplitude of oscillation. The simulation results showed that the combined electrodynamical effect of tides and UFK waves in the MLT region could explain the oscillations observed in the ionospheric parameters.

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4

McKinney, J. C., i R. Narayan. "Disc-jet coupling in black hole accretion systems - II. Force-free electrodynamical models". Monthly Notices of the Royal Astronomical Society 375, nr 2 (21.02.2007): 531–47. http://dx.doi.org/10.1111/j.1365-2966.2006.11220.x.

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5

Passante, Roberto. "Dispersion Interactions between Neutral Atoms and the Quantum Electrodynamical Vacuum". Symmetry 10, nr 12 (10.12.2018): 735. http://dx.doi.org/10.3390/sym10120735.

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Dispersion interactions are long-range interactions between neutral ground-state atoms or molecules, or polarizable bodies in general, due to their common interaction with the quantum electromagnetic field. They arise from the exchange of virtual photons between the atoms, and, in the case of three or more atoms, are not additive. In this review, after having introduced the relevant coupling schemes and effective Hamiltonians, as well as properties of the vacuum fluctuations, we outline the main properties of dispersion interactions, both in the nonretarded (van der Waals) and retarded (Casimir–Polder) regime. We then discuss their deep relation with the existence of the vacuum fluctuations of the electromagnetic field and vacuum energy. We describe some transparent physical models of two- and three-body dispersion interactions, based on dressed vacuum field energy densities and spatial field correlations, which stress their deep connection with vacuum fluctuations and vacuum energy. These models give a clear insight of the physical origin of dispersion interactions, and also provide useful computational tools for their evaluation. We show that this aspect is particularly relevant in more complicated situations, for example when macroscopic boundaries are present. We also review recent results on dispersion interactions for atoms moving with noninertial motions and the strict relation with the Unruh effect, and on resonance interactions between entangled identical atoms in uniformly accelerated motion.

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6

Bagiya, Mala S., K. N. Iyer, H. P. Joshi, Smitha V. Thampi, Takuya Tsugawa, Sudha Ravindran, R. Sridharan i B. M. Pathan. "Low-latitude ionospheric-thermospheric response to storm time electrodynamical coupling between high and low latitudes". Journal of Geophysical Research: Space Physics 116, A1 (styczeń 2011): n/a. http://dx.doi.org/10.1029/2010ja015845.

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7

Schäfer, Christian, Michael Ruggenthaler, Heiko Appel i Angel Rubio. "Modification of excitation and charge transfer in cavity quantum-electrodynamical chemistry". Proceedings of the National Academy of Sciences 116, nr 11 (7.02.2019): 4883–92. http://dx.doi.org/10.1073/pnas.1814178116.

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Energy transfer in terms of excitation or charge is one of the most basic processes in nature, and understanding and controlling them is one of the major challenges of modern quantum chemistry. In this work, we highlight that these processes as well as other chemical properties can be drastically altered by modifying the vacuum fluctuations of the electromagnetic field in a cavity. By using a real-space formulation from first principles that keeps all of the electronic degrees of freedom in the model explicit and simulates changes in the environment by an effective photon mode, we can easily connect to well-known quantum-chemical results such as Dexter charge-transfer and Förster excitation-transfer reactions, taking into account the often-disregarded Coulomb and self-polarization interaction. We find that the photonic degrees of freedom introduce extra electron–electron correlations over large distances and that the coupling to the cavity can drastically alter the characteristic charge-transfer behavior and even selectively improve the efficiency. For excitation transfer, we find that the cavity renders the transfer more efficient, essentially distance-independent, and further different configurations of highest efficiency depending on the coherence times. For strong decoherence (short coherence times), the cavity frequency should be in between the isolated excitations of the donor and acceptor, while for weak decoherence (long coherence times), the cavity should enhance a mode that is close to resonance with either donor or acceptor. Our results highlight that changing the photonic environment can redefine chemical processes, rendering polaritonic chemistry a promising approach toward the control of chemical reactions.

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8

Kherani, E. A., R. Raghavarao i R. Sekar. "Equatorial rising structure in nighttime upper E-region: a manifestation of electrodynamical coupling of spread F". Journal of Atmospheric and Solar-Terrestrial Physics 64, nr 12-14 (sierpień 2002): 1505–10. http://dx.doi.org/10.1016/s1364-6826(02)00087-1.

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9

Teubner, P. J. O., V. Karaganov, M. R. Law i P. M. Farrell. "Superelastic electron scattering from calcium and lithium". Canadian Journal of Physics 74, nr 11-12 (1.11.1996): 984–90. http://dx.doi.org/10.1139/p96-818.

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Superelastic scattering experiment were performed on optically pumped calcium atoms at energies of 25.7 and 45 eV referred to the ground state. Orientation and alignment parameters derived from these experiments are compared with the predictions of several theories based on a distorted-wave formalism. The agreement between theory and experiment is unsatisfactory at the lower energy at all scattering angles. At the higher energy agreement improves at small scattering angles but is poor at middle angles. The results of our quantum electrodynamical calculation on optical pumping in lithium are compared with our observations. We find such good agreement between theory and experiment that we explore the possibility of superelastic scattering experiments on lithium atoms that are optically pumped with single-frequency laser light. A two-frequency pumping system is described and its use in the observation of superelastic scattering from lithium is discussed. Orientation and alignment parameters are presented at an equivalent energy of 21.8 eV for small angles. They are compared with those predicted by two close-coupling calculations. Excellent agreement is found between the present work and the convergent close-coupling theory of Bray.

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10

Ip, W. H., C. M. Liu i K. C. Pan. "Transport and electrodynamical coupling of nano-grains ejected from the Saturnian rings and their possible ionospheric signatures". Icarus 276 (wrzesień 2016): 163–69. http://dx.doi.org/10.1016/j.icarus.2016.04.004.

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11

Andrews, David L., i David S. Bradshaw. "Controlling Electronic Energy Transfer: A Systematic Framework of Theory". Applied Sciences 12, nr 17 (27.08.2022): 8597. http://dx.doi.org/10.3390/app12178597.

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The transport of electronic excitation energy (EET) between ions, atoms, molecules or chromophores is an important process that occurs in a wide range of physical systems. The tantalising prospect of effective experimental control over such transfer is, in principle, amenable to a variety of different kinds of approach. Several of the most promising, which are analysed and compared in this paper, involve the influence of externally applied static electric or electromagnetic fields, or the exploitation of local media effects. A quantum electrodynamical framework is used as a common basis to describe the corresponding mechanisms, illustrated by specially adapted Feynman diagrams. It becomes evident that energy transfer between polar species engages an additional pairwise interaction beyond the EET coupling. Such an effect may also play an important role in interatomic Coulombic decay (ICD), a process that has recently attracted fresh interest. The control of ICD, in which the photoionisation of two nearby atoms via energy transfer, is determined to have analogous characteristics to conventional forms of EET.

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12

Salam, A. "The Unified Theory of Resonance Energy Transfer According to Molecular Quantum Electrodynamics". Atoms 6, nr 4 (11.10.2018): 56. http://dx.doi.org/10.3390/atoms6040056.

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An overview is given of the molecular quantum electrodynamical (QED) theory of resonance energy transfer (RET). In this quantized radiation field description, RET arises from the exchange of a single virtual photon between excited donor and unexcited acceptor species. Diagrammatic time-dependent perturbation theory is employed to calculate the transfer matrix element, from which the migration rate is obtained via the Fermi golden rule. Rate formulae for oriented and isotropic systems hold for all pair separation distances, R, beyond wave function overlap. The two well-known mechanisms associated with migration of energy, namely the R−6 radiationless transfer rate due to Förster and the R−2 radiative exchange, correspond to near- and far-zone asymptotes of the general result. Discriminatory pair transfer rates are also presented. The influence of an environment is accounted for by invoking the polariton, which mediates exchange and by introducing a complex refractive index to describe local field and screening effects. This macroscopic treatment is compared and contrasted with a microscopic analysis in which the role of a neutral, polarizable and passive third-particle in mediating transfer of energy is considered. Three possible coupling mechanisms arise, each requiring summation over 24 time-ordered diagrams at fourth-order of perturbation theory with the total rate being a sum of two- and various three-body terms.

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13

SIVASUBRAMANIAN, S., A. WIDOM i Y. N. SRIVASTAVA. "RADIATIVE PHASE TRANSITIONS AND CASIMIR EFFECT INSTABILITIES". Modern Physics Letters B 20, nr 22 (30.09.2006): 1417–25. http://dx.doi.org/10.1142/s0217984906011748.

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Molecular quantum electrodynamics lead to photon frequency shifts and thus to changes in condensed matter free energies (often called the Casimir effect). Strong quantum electrodynamic coupling between radiation and molecular motions can lead to an instability beyond which one or more photon oscillators undergo a displacement phase transition. We show that the phase boundary of the transition can be located by a Casimir free energy instability.

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14

Malkin, Andrey, Naum Ginzburg, Vladislav Zaslavsky, Ilya Zheleznov i Alexander Sergeev. "Quasi-Optical Theory of Relativistic Cherenkov Oscillators and Amplifiers with Oversized Electrodynamic Structures". Electronics 11, nr 8 (9.04.2022): 1197. http://dx.doi.org/10.3390/electronics11081197.

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Using the quasi-optical approach, we investigate wave propagation along the periodically corrugated surfaces and their interaction with rectilinear relativistic electron beams (REBs). At the periodical structure, the field can be expanded into a series of spatial harmonics, which, in the case of shallow corrugations, represent paraxial wavebeams with mutual coupling described within the method of effective surface magnetic currents. We present the dispersion equation for the normal waves. Two limit cases can be recognized: in the first one, the frequency is far from the Bragg resonance and the wave propagation can be described within the impedance approximation with the field presented as a sum of the fundamental slow wave and its spatial harmonics. In the interaction with a rectilinear REB, this corresponds to the convective instability of particles’ synchronism with the fundamental (0th) or higher spatial harmonics (TWT regime), or the absolute instability in the case of synchronism with the −1st harmonic of the backward wave (BWO regime). In the latter case, at the frequencies close to the Bragg resonance, the field is presented as two antiparallel quasi-optical wavebeams, leading to the absolute instability used in the surface-wave oscillators operating in the π-mode regime. Based on the developed theory, we determine the main characteristics of relativistic Cherenkov amplifiers and oscillators with oversized electrodynamical systems. We demonstrate the prospects for the practical implementation of relativistic surface-wave devices in submillimeter wavebands.

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15

Hays, M., V. Fatemi, D. Bouman, J. Cerrillo, S. Diamond, K. Serniak, T. Connolly i in. "Coherent manipulation of an Andreev spin qubit". Science 373, nr 6553 (22.07.2021): 430–33. http://dx.doi.org/10.1126/science.abf0345.

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Two promising architectures for solid-state quantum information processing are based on electron spins electrostatically confined in semiconductor quantum dots and the collective electrodynamic modes of superconducting circuits. Superconducting electrodynamic qubits involve macroscopic numbers of electrons and offer the advantage of larger coupling, whereas semiconductor spin qubits involve individual electrons trapped in microscopic volumes but are more difficult to link. We combined beneficial aspects of both platforms in the Andreev spin qubit: the spin degree of freedom of an electronic quasiparticle trapped in the supercurrent-carrying Andreev levels of a Josephson semiconductor nanowire. We performed coherent spin manipulation by combining single-shot circuit–quantum-electrodynamics readout and spin-flipping Raman transitions and found a spin-flip time TS = 17 microseconds and a spin coherence time T2E = 52 nanoseconds. These results herald a regime of supercurrent-mediated coherent spin-photon coupling at the single-quantum level.

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16

Alpin, Timur Yu, i Alexander B. Balakin. "The Einstein–Maxwell-aether-axion theory: Dynamo-optical anomaly in the electromagnetic response". International Journal of Modern Physics D 25, nr 04 (10.03.2016): 1650048. http://dx.doi.org/10.1142/s0218271816500486.

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We consider a pp-wave symmetric model in the framework of the Einstein–Maxwell-aether-axion theory. Exact solutions to the equations of axion electrodynamics are obtained for the model, in which pseudoscalar, electric and magnetic fields were constant before the arrival of a gravitational pp-wave. We show that dynamo-optical interactions, i.e. couplings of electromagnetic field to a dynamic unit vector field, attributed to the velocity of a cosmic substratum (aether, vacuum, dark fluid[Formula: see text]), provide the response of axionically active electrodynamic system to display anomalous behavior.

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17

Trubin, Alexander. "MUTUAL COUPLING COEFFICIENTS OF ROTATING RECTANGULAR DIELECTRIC RESONATORS IN CUT-OFF RECTANGULAR WAVEGUIDE". Information and Telecommunication Sciences, nr 1 (29.06.2021): 48–54. http://dx.doi.org/10.20535/2411-2976.12021.48-54.

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Background. A further increase in the speed of information transfer is determined by more stringent requirements for the elements of communication devices. One of the most important components of such devices is various filters, which are often made on the basis of dielectric resonators. Calculation of the parameters of multi-section filters is impossible without further development of the theory of their design. The development of filter theory is based on electrodynamic modelling, which involves calculating the coupling coefficients of dielectric resonators in various transmission lines. Objective. The aim of the research is to calculate and study the coupling coefficients of rectangular dielectric resonators with a rectangular metal waveguide when their axes rotate. Investigation of new effects to improve the performance of filters and other devices based on them. Methods. Methods of technical electrodynamics are used to calculate and analyse the coupling coefficients. The end result is to obtain new analytical formulas for new structures with rectangular dielectric resonators, which make it possible to analyse and calculate their coupling coefficients. Results. New analytical expressions are found for the coupling coefficients of dielectric resonators with the rotation of their axes in a rectangular waveguide. Conclusions. The theory of designing filters based on new structures of dielectric resonators with rotation of their axes in metal waveguides has been expanded. New analytical relationships and new patterns of change in the coupling coefficients are found. Keywords: dielectric filter; rectangular dielectric resonator; rotation; coupling coefficients.

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18

Namgaladze, A. A., M. Förster i R. Y. Yurik. "Analysis of the positive ionospheric response to a moderate geomagnetic storm using a global numerical model". Annales Geophysicae 18, nr 4 (30.04.2000): 461–77. http://dx.doi.org/10.1007/s00585-000-0461-8.

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Abstract. Current theories of F-layer storms are discussed using numerical simulations with the Upper Atmosphere Model, a global self-consistent, time dependent numerical model of the thermosphere-ionosphere-plasmasphere-magnetosphere system including electrodynamical coupling effects. A case study of a moderate geomagnetic storm at low solar activity during the northern winter solstice exemplifies the complex storm phenomena. The study focuses on positive ionospheric storm effects in relation to thermospheric disturbances in general and thermospheric composition changes in particular. It investigates the dynamical effects of both neutral meridional winds and electric fields caused by the disturbance dynamo effect. The penetration of short-time electric fields of magnetospheric origin during storm intensification phases is shown for the first time in this model study. Comparisons of the calculated thermospheric composition changes with satellite observations of AE-C and ESRO-4 during storm time show a good agreement. The empirical MSISE90 model, however, is less consistent with the simulations. It does not show the equatorward propagation of the disturbances and predicts that they have a gentler latitudinal gradient. Both theoretical and experimental data reveal that although the ratio of [O]/[N2] at high latitudes decreases significantly during the magnetic storm compared with the quiet time level, at mid to low latitudes it does not increase (at fixed altitudes) above the quiet reference level. Meanwhile, the ionospheric storm is positive there. We conclude that the positive phase of the ionospheric storm is mainly due to uplifting of ionospheric F2-region plasma at mid latitudes and its equatorward movement at low latitudes along geomagnetic field lines caused by large-scale neutral wind circulation and the passage of travelling atmospheric disturbances (TADs). The calculated zonal electric field disturbances also help to create the positive ionospheric disturbances both at middle and low latitudes. Minor contributions arise from the general density enhancement of all constituents during geomagnetic storms, which favours ion production processes above ion losses at fixed height under day-light conditions.Key words: Atmospheric composition and structure (thermosphere · composition and chemistry) · Ionosphere (ionosphere · atmosphere interactions; modelling and forecasting)

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19

XIAO, ZHI, i BO-QIANG MA. "LORENTZ VIOLATION DISPERSION RELATION AND ITS APPLICATION". International Journal of Modern Physics A 24, nr 07 (20.03.2009): 1359–81. http://dx.doi.org/10.1142/s0217751x09042955.

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We derive a modified dispersion relation (MDR) in the Lorentz violation extension of the quantum electrodynamics (QED) sector in the standard model extension (SME) framework. Based on the extended Dirac equation and corresponding MDR, we observe the resemblance of the Lorentz violation coupling to spin–gravity coupling. We also develop a neutrino oscillation mechanism induced by the presence of nondiagonal terms of Lorentz violation couplings in two-flavor space in a two-spinor formalism by explicitly assuming neutrinos to be Marjorana fermions. We also obtain a very stringent bound (∽ 10-25) on one of the Lorentz violation parameters by applying the MDR to the ultrahigh energy cosmic ray (UHECR) problem.

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20

Zhao, Changhao, Yongcheng He, Xiao Geng, Kaiyong He, Genting Dai, Jianshe Liu i Wei Chen. "Multi-Mode Bus Coupling Architecture of Superconducting Quantum Processor". Chinese Physics Letters 40, nr 1 (1.01.2023): 010301. http://dx.doi.org/10.1088/0256-307x/40/1/010301.

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Resonators in circuit quantum electrodynamics systems naturally carry multiple modes, which may have non-negligible influence on qubit parameters and device performance. While new theories and techniques are under investigation to deal with the multi-mode effects in circuit quantum electrodynamics systems, researchers have proposed novel engineering designs featuring multi-mode resonators to achieve enhanced functionalities of superconducting quantum processors. Here, we propose multi-mode bus coupling architecture, in which superconducting qubits are coupled to multiple bus resonators to gain larger coupling strength. Applications of multi-mode bus couplers can be helpful for improving iSWAP gate fidelity and gate speed beyond the limit of single-mode scenario. The proposed multi-mode bus coupling architecture is compatible with a scalable variation of the traditional bus coupling architecture. It opens up new possibilities for realization of scalable superconducting quantum computation with circuit quantum electrodynamics systems.

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21

Zuo, Shuguang, Zhaoyang Feng, Jian Pan i Xudong Wu. "Electromechanical coupling dynamic modeling and analysis of vertical electrodynamic shaker considering low frequency lateral vibration". Advances in Mechanical Engineering 12, nr 10 (październik 2020): 168781402096385. http://dx.doi.org/10.1177/1687814020963851.

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For the problem of relatively severe lateral vibration found in the vertical electrodynamic shaker experiment, an electromechanical coupling dynamic model of the electrodynamic shaker considering low-frequency lateral vibration is proposed. The reason and mechanism of the lateral vibration is explained and analyzed through this model. To establish this model, an electromagnetic force model of overall conditions is firstly built by fitting force samples with neural network method. The force samples are obtained by orthogonal test of finite element simulation, in which five factors of the moving coil including current, vertical position, flipping eccentricity angle, radial translational eccentric direction and distance are considered. Secondly, a 7-dof dynamic model of the electrodynamic shaker is developed with the consideration of the lateral vibration of the moving system. To obtain the transfer function accurately, the stiffness and damping parameters are identified. Finally, an electromechanical dynamic model is established by coupling the force model and the 7-dof dynamic model, and it is verified by experiments. The coupling model proposed can be further used for the control and optimization of the electrodynamic shaker.

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22

Martín-Ruiz, A., M. Cambiaso i L. F. Urrutia. "The magnetoelectric coupling in electrodynamics". International Journal of Modern Physics A 34, nr 28 (10.10.2019): 1941002. http://dx.doi.org/10.1142/s0217751x19410021.

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We explore a model akin to axion electrodynamics in which the axion field [Formula: see text] rather than being dynamical is a piecewise constant effective parameter [Formula: see text] encoding the microscopic properties of the medium inasmuch as its permittivity or permeability, defining what we call a [Formula: see text]-medium. This model describes a large class of phenomena, among which we highlight the electromagnetic response of materials with topological order, like topological insulators for example. We pursue a Green’s function formulation of what amounts to typical boundary-value problems of [Formula: see text]-media, when external sources or boundary conditions are given. As an illustration of our methods, which we have also extended to ponderable media, we interpret the constant [Formula: see text] as a novel topological property of vacuum, a so called [Formula: see text]-vacuum, and restrict our discussion to the cases where the permittivity and the permeability of the media is one. In this way we concentrate upon the effects of the additional [Formula: see text] coupling which induce remarkable magnetoelectric effects. The issue of boundary conditions for electromagnetic radiation is crucial for the occurrence of the Casimir effect, therefore we apply the methods described above as an alternative way to approach the modifications to the Casimir effect by the inclusion of topological insulators.

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23

Li, Ruiqi. "Coupling quantum emitters in metal–insulator–metal heterostructure: Green tensor approach in the quasi-static limit". AIP Advances 12, nr 8 (1.08.2022): 085310. http://dx.doi.org/10.1063/5.0102674.

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Coupling between quantum emitters (QEs) has been a topic extensively explored in recent years. Theoretical models based on the Lindblad master equation and mapping to cascaded quantum system has shed light to the chiral coupling phenomena from the aspect of microscopic quantum electrodynamics. Different from dissipative systems investigated in previous literature, we investigate the QE–QE coupling in Hermitian and pseudo-Hermitian systems by considering a multi-layered metal–insulator–amplifying metal heterostructure that represents the two kinds of system by adjusting the damping factor of the metallic layers. Our investigation is restricted in the quasi-static regime that gives qualitative conclusion without loss of simplicity. From the aspect of macroscopic quantum electrodynamics, the explanation of the coupling process is based on the dyadic Green’s function. We clearly reveal the different coupling characteristics of differently polarized transition dipole moments.

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GAETE, PATRICIO. "REMARKS ON A CHERN–SIMONS-LIKE COUPLING". Modern Physics Letters A 26, nr 37 (7.12.2011): 2813–21. http://dx.doi.org/10.1142/s0217732311037121.

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We consider the static quantum potential for a gauge theory which includes a light massive vector field interacting with the familiar U (1) QED photon via a Chern–Simons-like coupling, by using the gauge-invariant, but path-dependent, variables formalism. An exactly screening phase is then obtained, which displays a marked departure of a qualitative nature from massive axionic electrodynamics. The above static potential profile is similar to that encountered in axionic electrodynamics consisting of a massless axion-like field, as well as to that encountered in the coupling between the familiar U (1) QED photon and a second massive gauge field living in the so-called U (1)h hidden-sector, inside a superconducting box.

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Ünlütürk, Kıvanç İ., i Cem Yetişmişoğlu. "A model of non-minimally coupled gravitation and electromagnetism in (1+2) dimensions". Journal of Physics: Conference Series 2191, nr 1 (1.02.2022): 012021. http://dx.doi.org/10.1088/1742-6596/2191/1/012021.

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Abstract Following earlier works of Dereli and collaborators, we study a three dimensional toy model where we extend the topologically massive gravity with electrodynamics by the most general RF 2-type non-minimal coupling terms. Here R denotes the possible curvature terms and F denotes the electromagnetic 2-form. We derive the variational feld equations and look for exact solutions on constant negative curvature space-times with a constant, self-dual electromagnetic feld. The notion of self-dual electromagnetic felds in three dimensions is introduced by Dereli and collaborators in the study of exact solutions of models with gravity-electromagnetism couplings. We note the conditions that the parameters of the model have to satisfy for these self-dual solutions to exist.

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Zhu, Shi Sha, Wei Yuan, Xue Peng Qian i Tao Tang. "The Study of Dynamic Equations of ER Fluids Based on Multi-Field Coupling". Advanced Materials Research 779-780 (wrzesień 2013): 375–79. http://dx.doi.org/10.4028/www.scientific.net/amr.779-780.375.

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Based on the multi-field coupling effect and the theory of electrodynamics, as well as the capture effect of the ER fluids flowing through the control field, by analyzing on the flow characteristics under the electric - power - thermal coupling load environment, the structure-force dynamic coupling mathematical model of ER fluids is derived under multi-field.

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27

Nelson, D. A., i E. J. Shaughnessy. "Electric Field Effects on Natural Convection in Enclosures". Journal of Heat Transfer 108, nr 4 (1.11.1986): 749–54. http://dx.doi.org/10.1115/1.3247008.

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The enhancement of convective heat transfer by an electric field is but one aspect of the complex thermoelectric phenomena which arise from the interaction of fluid dynamic and electric fields. Our current knowledge of this area is limited to a very few experimental studies. There has been no formal analysis of the basic coupling modes of the Navier–Stokes and Maxwell equations which are developed in the absence of any appreciable magnetic fields. Convective flows in enclosures are particularly sensitive because the limited fluid volumes, recirculation, and generally low velocities allow the relatively weak electric body force to exert a significant influence. In this work, the modes by which the Navier–Stokes equations are coupled to Maxwell’s equations of electrodynamics are reviewed. The conditions governing the most significant coupling modes (Coulombic forces, Joule heating, permittivity gradients) are then derived within the context of a first-order theory of electrohydrodynamics. Situations in which these couplings may have a profound effect on the convective heat transfer rate are postulated. The result is an organized framework for controlling the heat transfer rate in enclosures.

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28

Shao, Yinming, Zhiyuan Sun, Ying Wang, Chenchao Xu, Raman Sankar, Alexander J. Breindel, Chao Cao i in. "Optical signatures of Dirac nodal lines in NbAs2". Proceedings of the National Academy of Sciences 116, nr 4 (17.12.2018): 1168–73. http://dx.doi.org/10.1073/pnas.1809631115.

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Using polarized optical and magneto-optical spectroscopy, we have demonstrated universal aspects of electrodynamics associated with Dirac nodal lines that are found in several classes of unconventional intermetallic compounds. We investigated anisotropic electrodynamics of NbAs2 where the spin-orbit coupling (SOC) triggers energy gaps along the nodal lines. These gaps manifest as sharp steps in the optical conductivity spectra σ1(ω). This behavior is followed by the linear power-law scaling of σ1(ω) at higher frequencies, consistent with our theoretical analysis for dispersive Dirac nodal lines. Magneto-optics data affirm the dominant role of nodal lines in the electrodynamics of NbAs2.

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29

Yu, Shuang, i Changjun Gao. "Exact black hole solutions with nonlinear electrodynamic field". International Journal of Modern Physics D 29, nr 05 (9.03.2020): 2050032. http://dx.doi.org/10.1142/s0218271820500327.

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We construct exact black hole solutions to Einstein gravity with nonlinear electrodynamic field. In these solutions, there are, in general, four parameters. They are physical mass, electric charge, cosmological constant and the coupling constant. These solutions differ significantly from the Reissner–Nordström–de Sitter solution in Einstein–Maxwell gravity with a cosmological constant, due to the presence of coupling constant. For example, some of them are endowed with a topological defect on angle [Formula: see text] and the electric charge of some can be much larger or smaller than their mass by varying the coupling constant. On the other hand, these spacetimes are all asymptotically de Sitter (or anti-de Sitter). As a result, their causal structure is similar to the Reissner–Nordström–de Sitter spacetime. Finally, the investigations on the thermodynamics reveal that the coupling constant except for solution-4 has the opposite effect as temperature on the phase, structure of black holes. Concretely, the phase-space changes from single phase to three phases with the decrease of temperature. On the contrary, it changes from three phases to a single phase with the decrease of coupling constant.

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30

Rekalo, Michail P., i Egle Tomasi-Gustafsson. "The gVσγ coupling constants in hadron electrodynamics". Nuclear Physics A 725 (wrzesień 2003): 116–26. http://dx.doi.org/10.1016/s0375-9474(03)01605-1.

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31

Cheng, Shuo, i David P. Arnold. "Defining the coupling coefficient for electrodynamic transducers". Journal of the Acoustical Society of America 134, nr 5 (listopad 2013): 3561–72. http://dx.doi.org/10.1121/1.4824347.

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32

Lysak, Robert L. "Electrodynamic coupling of the magnetosphere and ionosphere". Space Science Reviews 52, nr 1-2 (luty 1990): 33–87. http://dx.doi.org/10.1007/bf00704239.

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Florence, Tristan L., Curtis V. McCully i Dwight E. Neuenschwander. "A Pedagogical Model of General Covariance Coupling Electrodynamics and Gravitation". Physics Educator 03, nr 01 (marzec 2021): 2150003. http://dx.doi.org/10.1142/s2661339521500037.

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In his 1951 model of the effects of a star’s radiation on its gravitation, P.C. Vaidya used radiation fields of flat spacetime. Wondering why Vaidya did not include the effects of gravitation on electrodynamics, we apply the principle of general covariance to gravitation and radiation. Others have addressed this problem with numerical methods, but, like Vaidya, we seek an analytic solution. Along the way, we see how prescient was Vaidya’s choice in modeling the radiation. Pursued originally as a pedagogical exercise with undergraduate physicists, our results compare favorably to similar models, and illustrate general relativity theorems. Given recent interest in teaching general relativity to undergraduates, a system that couples gravitation and electrodynamics and is solvable with elementary integrations may hold pedagogical interest.

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34

UKITA, M., M. KOMACHIYA i R. FUKUDA. "GAUGE INVARIANT STUDY OF THE STRONG COUPLING PHASE OF MASSLESS QUANTUM ELECTRODYNAMICS". International Journal of Modern Physics A 05, nr 09 (10.05.1990): 1789–800. http://dx.doi.org/10.1142/s0217751x90000830.

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The strong coupling phase of massless Quantum Electrodynamics is studied in a gauge invariant way. The formalism is given in which the order parameter of the chiral symmetry breaking is calculated through the vacuum polarization diagrams. Applying this method, the critical coupling constant is shown to exist that is independent of the gauge parameter but is now dependent on the ratio of the two kinds of cutoff. Implication of this new parameter on the renormalization scheme in the strong coupling phase is discussed.

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35

Ballarini, Dario, i Simone De Liberato. "Polaritonics: from microcavities to sub-wavelength confinement". Nanophotonics 8, nr 4 (12.02.2019): 641–54. http://dx.doi.org/10.1515/nanoph-2018-0188.

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AbstractFollowing the initial success of cavity quantum electrodynamics in atomic systems, strong coupling between light and matter excitations is now achieved in several solid-state set-ups. In those systems, the possibility to engineer quantum emitters and resonators with very different characteristics has allowed access to novel nonlinear and non-perturbative phenomena of both fundamental and applied interest. In this article, we will review some advances in the field of solid-state cavity quantum electrodynamics, focussing on the scaling of the relevant figures of merit in the transition from microcavities to sub-wavelength confinement.

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36

Ama-Tul-Mughani, Qanitah, i M. Sharif. "Stability analysis of anisotropic universe in nonlinear electrodynamics". International Journal of Modern Physics D 28, nr 16 (8.10.2019): 2040003. http://dx.doi.org/10.1142/s0218271820400039.

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This paper is devoted to analyze the stability of locally rotationally symmetric Bianchi type I model through phase space portrait in the presence of nonlinear electrodynamics. The normalized dimensionless quantities are introduced to construct an autonomous system of equations. The critical points and respective eigenvalues are evaluated for different linear forms of coupling between scalar field models and dark matter to discuss the stability of the cosmos. We conclude that the increase/decrease of stability in the presence of nonlinear electrodynamics completely depends on the choice of interaction terms between matter and dark energy models.

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37

BALART, LEONARDO. "ENERGY DISTRIBUTION OF (2+1)-DIMENSIONAL BLACK HOLES WITH NONLINEAR ELECTRODYNAMICS". Modern Physics Letters A 24, nr 34 (10.11.2009): 2777–85. http://dx.doi.org/10.1142/s021773230903117x.

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The energy distributions for a black hole solution resulting from coupling electrodynamics and gravity in (2+1) dimensions are obtained. This solution considers the correction for a (2+1) static charged black hole from the first contribution of the weak field limit of one-loop QED in (2+1) dimensions. The Einstein and Møller energy–momentum prescriptions are used to evaluate the energy distributions associated with the mentioned (2+1)-dimensional black hole and other (2+1) black hole solutions coupled with nonlinear electrodynamics. A relation that connects the coefficients of both prescriptions is established.

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38

Aldabergenov, Yermek, i Sergei Ketov. "Modified Born–Infeld-Dilaton-Axion Coupling in Supersymmetry". Symmetry 11, nr 1 (24.12.2018): 14. http://dx.doi.org/10.3390/sym11010014.

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We propose the supersymmetric extension of the modified Born–Infeld-axion-dilaton non-linear electrodynamics that has confined static abelian solutions used for describing the electromagnetic confinement in the presence of axion and dilaton fields, as well as charged matter. The supersymmetric extension also has the non-trivial scalar potential that implies the upper bounds on the matter fields.

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39

Ahmadi, E., H. R. Chalabi, A. Arab i S. Khorasani. "Cavity quantum electrodynamics in the ultrastrong coupling regime". Scientia Iranica 18, nr 3 (czerwiec 2011): 820–26. http://dx.doi.org/10.1016/j.scient.2011.06.009.

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40

Niemczyk, T., F. Deppe, H. Huebl, E. P. Menzel, F. Hocke, M. J. Schwarz, J. J. Garcia-Ripoll i in. "Circuit quantum electrodynamics in the ultrastrong-coupling regime". Nature Physics 6, nr 10 (25.07.2010): 772–76. http://dx.doi.org/10.1038/nphys1730.

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41

Kravets, Vira V., Oleg A. Yeshchenko, Victor V. Gozhenko, Leonidas E. Ocola, David A. Smith, James V. Vedral i Anatoliy O. Pinchuk. "Electrodynamic coupling in regular arrays of gold nanocylinders". Journal of Physics D: Applied Physics 45, nr 4 (6.01.2012): 045102. http://dx.doi.org/10.1088/0022-3727/45/4/045102.

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42

Richmond, A. D., i R. G. Roble. "Electrodynamic coupling effects in the thermosphere/ionosphere system". Advances in Space Research 20, nr 6 (styczeń 1997): 1115–24. http://dx.doi.org/10.1016/s0273-1177(97)00754-0.

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43

GAETE, PATRICIO, i IVÁN SCHMIDT. "COULOMB'S LAW CORRECTIONS FROM A GAUGE-KINETIC MIXING". International Journal of Modern Physics A 26, nr 05 (20.02.2011): 863–71. http://dx.doi.org/10.1142/s0217751x11051500.

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We study the connection or equivalence between two well-known extensions of the Standard Model, that is, for the coupling between the familiar massless electromagnetism U (1) QED and a hidden-sector U (1)h, and axionic electrodynamics. Our discussion is carried out using the gauge-invariant but path-dependent variables formalism, which is an alternative to the Wilson loop approach. When we compute in this way the static quantum potential for the coupling between the familiar massless electromagnetism U (1) QED and a hidden-sector U (1)h, the result of this calculation is a Yukawa correction to the usual static Coulomb potential. Previously,14, we have shown that axionic electrodynamics has a different structure which is reflected in a confining piece. Therefore, both extensions of the Standard Model are not equivalent. Interestingly, when the above calculation is done inside a superconducting box, the Coulombic piece disappears leading to a screening phase.

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44

Schlawin, F., D. M. Kennes i M. A. Sentef. "Cavity quantum materials". Applied Physics Reviews 9, nr 1 (marzec 2022): 011312. http://dx.doi.org/10.1063/5.0083825.

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The emergent field of cavity quantum materials bridges collective many-body phenomena in solid state platforms with strong light–matter coupling in cavity quantum electrodynamics. This brief review provides an overview of the state of the art of cavity platforms and highlights recent theoretical proposals and first experimental demonstrations of cavity control of collective phenomena in quantum materials. This encompasses light–matter coupling between electrons and cavity modes, cavity superconductivity, cavity phononics and ferroelectricity, correlated systems in a cavity, light–magnon coupling, cavity topology and the quantum Hall effect, as well as super-radiance. An outlook of potential future developments is given.

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45

Kovtun-Kuzhel, V. A., I. A. Mazaila i A. N. Ponyavina. "ELECTROMAGNETIC RADIATION SCATTERING BY LINEAR LOW-PARTICLE AGGREGATES OF FINITE DIELECTRIC CYLINDERS". Journal of Applied Spectroscopy 89, nr 1 (21.01.2022): 57–63. http://dx.doi.org/10.47612/0514-7506-2022-89-1-57-63.

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A numerical simulation of functions of the angular distribution of the scattering intensity for dimers and thrimers of finite dielectric cylinders is made using the formalism of the volume integral equation. The function of the angular distribution of the scattering intensity dependence on the optical and geometric parameters of single finite cylinders and their mutual location is studied. It is shown that the electrodynamic interaction between the cylinders leads to a strong change of the angular distribution of intensity of the radiation scattered by this system in comparison with that for two cylinders without electrodynamic coupling.

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46

Hallmann, Damian, Piotr Jankowski, Janusz Mindykowski, Kazimierz Jakubiuk, Mikołaj Nowak i Mirosław Woloszyn. "Modeling of Electrodynamic Phenomena in an Ultra-Rapid Inductive–Dynamic Actuator as Applied to Hybrid Short-Circuit Breakers—A Review Study". Energies 15, nr 24 (12.12.2022): 9394. http://dx.doi.org/10.3390/en15249394.

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This article is a study of the research development of electrodynamic phenomena occurring in ultra-fast electrodynamic drives. These types of linear drives are among the fastest, not only because of the huge accelerations achieved, but, above all, because of the extremely short reaction time. For this reason, electrodynamic drives are used in hybrid short-circuit breakers. The phenomena occurring in this type of drive are actually magneto-thermo-elastic in nature, but the coupling of these phenomena should be considered weak if the criteria for repeatable operation in a hybrid circuit breaker system are met. The authors have been researching this type of drive for many years through not only experimental studies, but also primarily simulation studies developing models of such drives. The authors present the history of the development starting from the first works of Thomson, and Kesserling and ending with the most current models, including mainly their own. This article presents mainly works studying electrodynamic phenomena. Thermal and mechanical phenomena were comprehensively presented by the authors in previous papers.

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47

MCKEON, D. G. C. "THE RELATIONSHIP BETWEEN BARE AND RENORMALIZED COUPLINGS IN SCALAR ELECTRODYNAMICS". Modern Physics Letters A 24, nr 23 (30.07.2009): 1823–28. http://dx.doi.org/10.1142/s0217732309031235.

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When using dimensional regularization, the bare couplings are expressed as a power series in (2-n/2)-1 where n is the number of dimensions. It is shown how the renormalization group can be used to sum the leading pole, next-to-leading pole etc. contributions to these sums in scalar electrodynamics (or any theory with multiple couplings).

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48

NASSIF, CLÁUDIO, i P. R. SILVA. "QUANTUM ELECTRODYNAMICS AND CHROMODYNAMICS TREATED THROUGH THOMPSON'S APPROACH". International Journal of Modern Physics A 21, nr 18 (20.07.2006): 3809–24. http://dx.doi.org/10.1142/s0217751x06031508.

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In this work we apply Thompson's method (of the dimensions and scales) to study some features of the Quantum Electrodynamics and Chromodynamics. This heuristic method can be considered as a simple and alternative way to the Renormalization Group approach and when applied to QED-Lagrangian is able to obtain in a first approximation both the running coupling constant behavior of α(μ) and the mass m(μ). The calculations are evaluated only at dc = 4, where dc is the upper critical dimension of the problem, so that we obtain the logarithmic behavior both for the coupling α and the excess of mass Δm on the energy scale μ. Although our results are well known in the vast literature of field theories, the advantage of Thompson's method, beyond its simplicity is that it is able to extract directly from QED-Lagrangian the physical (finite) behavior of α(μ) and m(μ), bypassing hard problems of divergences which normally appear in the conventional renormalization schemes applied to field theories like QED. Quantum Chromodynamics (QCD) is also treated by the present method in order to obtain the quark condensate value. Besides this, the method is also able to evaluate the vacuum pressure at the boundary of the nucleon. This is done by assumming a step function behavior for the running coupling constant of the QCD, which fits nicely to some quantities related to the strong interaction evaluated through the MIT-bag model.

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49

Fabiano, Nikola. "Beta functions in the quantum field theory". Vojnotehnicki glasnik 70, nr 1 (2022): 157–68. http://dx.doi.org/10.5937/vojtehg70-32131.

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Introduction/purpose: The running of the coupling constant in various Quantum Field Theories and a possible behaviour of the beta function are illustrated. Methods: The Callan-Symanzik equation is used for the study of the beta function evolution. Results: Different behaviours of the coupling constant for high energies are observed for different theories. The phenomenon of asymptotic freedom is of particular interest. Conclusions: Quantum Electrodynamics (QED) and Quantum Chromodinamics (QCD) coupling constants have completely different behaviours in the regime of high energies. While the first one diverges for finite energies, the latter one tends to zero as energy increases. This QCD phenomenon is called asymptotic freedom.

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MAJUMDAR, PARTHASARATHI. "NEW PARITY-VIOLATING PHOTON–AXION INTERACTION". Modern Physics Letters A 19, nr 17 (7.06.2004): 1319–25. http://dx.doi.org/10.1142/s0217732304013908.

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A variant of an earlier proposal by the author and SenGupta, to describe four-dimensional Maxwell electrodynamics in Einstein–Cartan spacetimes through a Kalb–Ramond field as an intermediary, is shown to lead to a new Maxwell–Kalb–Ramond coupling that violates spatial parity, even when the KR gauge field has its standard parity assignment. One consequence of this coupling seems to be a modulation, independent of wavelength but dependent on the KR field strength, of the intensity of synchrotron radiation observed from distant galactic sources.

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