Scattering of electromagnetic waves from a time-varying fractal surface

1993 ◽  
Vol 6 (1) ◽  
pp. 87-91 ◽  
Author(s):  
Ji Chen ◽  
Titus Lo ◽  
John Litva ◽  
Henry Leung
Keyword(s):  
Electromagnetic Waves ◽  
Time Varying ◽  
Fractal Surface

scholarly journals Propagation characteristics of THz electromagnetic waves in time varying un-magnetized plasma

2014 ◽  
Vol 63 (19) ◽  
pp. 194101
Author(s):  
Chen Wen-Bo ◽  
Gong Xue-Yu ◽  
Deng Xian-Jun ◽  
Feng Jun ◽  
Huang Guo-Yu
Keyword(s):  
Electromagnetic Waves ◽  
Magnetized Plasma ◽  
Time Varying ◽  
Propagation Characteristics

scholarly journals Time-varying Doppler Effect formula and its application in Cosmology

2021 ◽  
Author(s):  
Qian Chen
Keyword(s):  
Doppler Effect ◽  
Constant Velocity ◽  
Electromagnetic Waves ◽  
Wave Equations ◽  
Light Emission ◽  
Implicit Assumption ◽  
Time Varying ◽  
Cosmological Redshift ◽  
The Doppler Effect ◽  
Hubble’S Law

The Doppler effect for electromagnetic waves results in either a redshift or blueshift of light and is of great use in astronomy. It has been used to measure the speed of stars and galaxies approaching or receding from the earth. Currently, all Doppler effect formulas only work for constant velocities. Hence, the application of the Doppler effect includes the implicit assumption of a constant velocity of the motion during the period from the light emission to measurement. Since the light from remote stars detected from Earth may be from millions of years ago, it is difficult to assume that these stars kept moving at constant velocity for the long period, which may become a potential concern. A time-varying Doppler effect formula is mathematically derived from the principle of constant light speed, which is consistent with the classical and the redshift formulas. This formula is also supported by existing experiments and theoretically proved by Maxwell’s wave equations. The potential application of this time-varying Doppler effect formula in cosmology is discussed with the examples of cosmological redshift and Hubble’s law. The paper shows that the cosmological redshift can be interpreted as a special case of the time-varying Doppler effect. Further discussion between the observed Hubble’s redshift relationship and Hubble’s law may be needed.

scholarly journals MOMENTUM OF AN ELECTROMAGNETIC WAVE IN TIME-VARYING DIELECTRIC MEDIA

2021 ◽  
Vol 55 (2 (255)) ◽  
pp. 148-152
Author(s):  
Karen K. Grigoryan
Keyword(s):  
Dielectric Constant ◽  
Electromagnetic Wave ◽  
Dielectric Permittivity ◽  
Electromagnetic Waves ◽  
Dielectric Medium ◽  
Time Varying ◽  
Spatial Homogeneity ◽  
Instantaneous Change ◽  
Dielectric Media

In the context of the Abraham–Minkowski controversy, the problem of the propagation of electromagnetic waves in a linear dielectric medium with a time-varying dielectric constant is considered. It is shown that the momentum of an electromagnetic wave in the form of Minkowski is preserved with an instantaneous change in the dielectric permittivity of the medium. At the same time, the Abraham momentum is not conserved, despite the spatial homogeneity of the problem. This circumstance is interpreted as a manifestation of the Abraham force.

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