Results 21 to 30 of about 31,184 (319)
Spinning gauged boson and Dirac stars: A comparative study
Physics Letters B, 2022 Scalar boson stars and Dirac stars are solitonic solutions of the Einstein–Klein-Gordon and Einstein-Dirac classical equations, respectively. Despite the different bosonic vs.
C. Herdeiro +3 more
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Electromagnetic Helicity in Classical Physics
, 2019 This pedagogical note revisits the concept of electromagnetic helicity in classical systems. In particular, magnetic helicity and its role in mean field dynamo theories is briefly discussed highlighting the major mathematical inconsistency in most of these theories---violation of magnetic helicity conservation. A short review of kinematic dynamo theory
Amir Jafari
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Classical limit of higher-spin string amplitudes
Journal of High Energy Physics, 2023 It has been shown that a special set of three-point amplitudes between two massive spinning states and a graviton reproduces the linearised stress-energy tensor for a Kerr black hole in the classical limit. In this work we revisit this result and compare
Lucile Cangemi, Paolo Pichini
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Spin supplementary condition in quantum field theory: covariant SSC and physical state projection
Journal of High Energy Physics, 2023 The spin supplementary conditions are constraints on spin degrees of freedom in classical relativity which restricts physical degrees of freedom to rotations.
Jung-Wook Kim, Jan Steinhoff
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Electromagnetism in terms of quantum measurements [PDF]
, 2015 We consider the question whether electromagnetism can be derived from quantum physics of measurements. It turns out that this is possible, both for quantum and classical electromagnetism, if we use more recent innovations such as smearing of observables ...
Accardi L. +12 more
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Geometrical formulation of classical electromagnetism
, 2008 A general affine connection has enough degrees of freedom to describe the classical gravitational and electromagnetic fields in the metric-affine formulation of gravity. The gravitational field is represented in the Lagrangian by the symmetric part of the Ricci tensor, while the classical electromagnetic field is represented geometrically by the tensor
Nikodem J. Popławski
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The classical geometrization of the electromagnetism [PDF]
International Journal of Geometric Methods in Modern Physics, 2015 Following the line of the history, if by one side the electromagnetic theory was consolidated on the 19th century, the emergence of the special and the general relativity theories on the 20th century opened possibilities of further developments, with the search for the unification of the gravitation and the electromagnetism on a single unified theory.
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Classical analog of electromagnetically induced transparency [PDF]
American Journal of Physics, 2002 We present a classical analog of electromagnetically induced transparency (EIT). In a system of just two coupled harmonic oscillators subject to a harmonic driving force, we reproduce the phenomenology observed in EIT. We also describe a simple experiment with two linearly coupled RLC circuits which can be incorporated into an undergraduate laboratory.
Garrido Alzar, Carlos L. +2 more
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On the electrodynamics of moving bodies at low velocities [PDF]
, 2005 We discuss the seminal article in which Le Bellac and Levy-Leblond have identified two Galilean limits of electromagnetism, and its modern implications.
Arzeliès H +40 more
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Semi-Active Magnetic Levitation System for Education
Applied Sciences, 2021 This paper describes how to construct a low-cost magnetic levitation system (MagLev). The MagLev has been intensively used in engineering education, allowing instructors and students to learn through hands-on experiences of essential concepts, such as ...
Gisela Pujol-Vázquez +3 more
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