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- W1968496711 abstract "Two main topics are discussed in this work. First we present a manifestly covariant description of geometrical optics in spacetime. Then, we consider the geometrical optics of inhomogeneous waves for which the characteristic surfaces depend non-linearly on time so that wavenumber and frequency have only a local meaning. To make the physical interpretation easier we also discuss the rays corresponding to the inhomogeneous solutions of the paraxial wave equation in an inhomogeneous medium." @default.
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- W1968496711 date "1993-11-01" @default.
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- W1968496711 title "Spacetime geometrical optics" @default.
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- W1968496711 doi "https://doi.org/10.1088/0963-9659/2/6/007" @default.
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