Physics – Optics
Scientific paper
Dec 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980gregr..12.1015e&link_type=abstract
General Relativity and Gravitation, vol. 12, Dec. 1980, p. 1015-1027.
Physics
Optics
1
Cosmic Dust, Cosmic Plasma, Electromagnetic Radiation, Gravitational Waves, Perturbation Theory, Wave Propagation, Approximation, Asymptotic Methods, Cold Plasmas, Electromagnetic Fields, Geometrical Optics, Gravitational Fields, High Frequencies, Ionization, Tensors
Scientific paper
Wavelike perturbations of a system consisting of a gravitational and an electromagnetic field and a dust with a small ionized component are studied. By using the spin coefficient formalism, the perturbations of the various quantities characterizing the system are expanded into asymptotic series. The whole dynamics of high-frequency waves is shown to be governed by four propagation equations for the expansion coefficients of tetrad components 4 and 2 of perturbations of the Weyl tensor and Maxwell tensor in each order of the expansion. The perturbations of all the other variables can be derived without integration. The propagation equations are explicitly derived and discussed in the zeroth-order (geometrical optics) and in the first-order approximations. The influence of dust and plasma on the propagation is considered in the first-order equations.
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