Results 251 to 260 of about 383,957 (288)

6-Optics and a general theory of gravitation and electromagnetism

Soviet Physics Journal, 1984
It is shown that the equation of motion of material particles in a curved spacetime in the presence of electromagnetic field, known from general relativity, is equivalent to an equation for a geodesic line in a 6-dimensional Riemannian manifold of signature (+----+), at least when a special choice of the 6-metric has been made.
Yu. S. Vladimirov, A. A. Kozlenkov
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Theory of the anomalous electromagnetic generation of ultrasound in aluminum

Physical Review B, 1978
Anomalies observed in electromagnetic generation of ultrasound in aluminum are explained on the basis of known Fermi-surface geometry. At large values of ${\ensuremath{\omega}}_{c} \ensuremath{\tau}$ the topology of the second-zone hole sheet permits only holelike cyclotron orbits, while for small values of ${\ensuremath{\omega}}_{c} \ensuremath{\tau}$
N. C. Banik, A. W. Overhauser
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Generalized-ray theory for electromagnetic fields in layered media

2013
Generalized-ray theory for time-domain electromagnetic fields in a horizontally layered medium is developed. After introducing appropriate integral transformations and source-type field representations in vertically inhomogeneous media, the solution is written out in terms of generalized ray constituents whose space-time counterparts are constructed ...
Štumpf, M. (author), De Hoop, A.T. (author), Vandenbosch, G.A.E. (author)   +2 more
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Generalization of the Hoyle-Narlikar theory and connection between electromagnetism and gravitation in the generalized theory

Gravitation and Cosmology, 2013
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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A spinor formulation of electromagnetic theory in general relativity

Il Nuovo Cimento, 1964
The spinor formulation of the Maxwell-Lorentz theory that was developed earlier bySachs andSchwebel (2–3) is extended to a generally covariant formalism. The underlying group for electrodynamics is thereby generalized from the proper inhomogeneous Lorentz groupLp to a special topological groupT.
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Null electromagnetic fields in the generalized Einstein–Maxwell field theory

Journal of Mathematical Physics, 1979
In this paper solutions to the source-free generalized Einstein–Maxwell field equations with a null electromagnetic field are investigated. It is argued that the principal null congruence of the null electromagnetic field need not be geodesic, shear-free or a repeated principal null congruence of the gravitational field.
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The arrow of electromagnetic time and the generalized absorber theory

Foundations of Physics, 1983
The problem of the direction of electromagnetic time, i.e., the complete dominance of retarded electromagnetic radiation over advanced radiation in the universe, is considered in the context of a generalized form of the Wheeler-Feynman absorber theory in an open expanding universe with a singularity atT=0.
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Theory of Electromagnetic Generation of Sound in Semimetals

Physical Review B, 1973
K. C. Lee, A. M. de Graaf, D. Hsu, R. L. Thomas   +3 more
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Models, structure, and generality in Clerk Maxwell’s theory of electromagnetism

2017
This article examines the gradual development of James Clerk Maxwell’s electromagnetic theory, arguing that he aimed at general structures through his models, illustrations, formal analogies, and scientific metaphors. It also considers a few texts in which Maxwell expounds his conception of physical theories and their relation to mathematics. Following
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Theory of force-free electromagnetic fields. I. General theory

Physical Review E, 1997
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