Time-Frequency Integrals and the Stationary Phase Method in Problems of Waves Propagation from Moving Sources
Vernadsky National Library of Ukraine
Переглянути архів Інформація| Поле | Співвідношення | |
| Title |
Time-Frequency Integrals and the Stationary Phase Method in Problems of Waves Propagation from Moving Sources
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| Creator |
Burlak, G.
Rabinovich, V. |
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| Description |
The time-frequency integrals and the two-dimensional stationary phase method are applied to study the electromagnetic waves radiated by moving modulated sources in dispersive media. We show that such unified approach leads to explicit expressions for the field amplitudes and simple relations for the field eigenfrequencies and the retardation time that become the coupled variables. The main features of the technique are illustrated by examples of the moving source fields in the plasma and the Cherenkov radiation. It is emphasized that the deeper insight to the wave effects in dispersive case already requires the explicit formulation of the dispersive material model. As the advanced application we have considered the Doppler frequency shift in a complex single-resonant dispersive metamaterial (Lorenz) model where in some frequency ranges the negativity of the real part of the refraction index can be reached. We have demonstrated that in dispersive case the Doppler frequency shift acquires a nonlinear dependence on the modulating frequency of the radiated particle. The detailed frequency dependence of such a shift and spectral behavior of phase and group velocities (that have the opposite directions) are studied numerically.
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| Date |
2019-02-18T17:54:31Z
2019-02-18T17:54:31Z 2012 |
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| Type |
Article
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| Identifier |
Time-Frequency Integrals and the Stationary Phase Method in Problems of Waves Propagation from Moving Sources / G. Burlak, V. Rabinovich // Symmetry, Integrability and Geometry: Methods and Applications. — 2012. — Т. 8. — Бібліогр.: 57 назв. — англ.
1815-0659 2010 Mathematics Subject Classification: 78A25; 78A35 DOI: http://dx.doi.org/10.3842/SIGMA.2012.096 http://dspace.nbuv.gov.ua/handle/123456789/148687 |
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| Language |
en
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| Relation |
Symmetry, Integrability and Geometry: Methods and Applications
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| Publisher |
Інститут математики НАН України
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