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We investigate Isaacson's high-frequency gravitational waves which propagatein some relevant cosmological models, in particular the FRW spacetimes. Theirtime evolution in Fourier space is explicitly obtained for various metric formsof (anti--)de Sitter universe. Behaviour of high-frequency waves in theanisotropic Kasner spacetime is also described.Comment: 14 pages, 8 figures, to appear in Czech. J. Phy

Evolution of high-frequency gravitational waves in some cosmological models