Abstract
The propagation of gravitational waves in cold matter has been analyzed in the geometrical-optics approximation showing no difference from the propagationin vacuum. In a cosmological background a plasmalike dispersion relation has been shown to appear in the postgeometrical optics approximation only. A qualitative discussion of the physical meaning of the present result is given and compared with previous works.
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Sacchetti, F., Trevese, D. On the dispersion of gravitational waves. Gen Relat Gravit 10, 947–952 (1979). https://doi.org/10.1007/BF00756759
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DOI: https://doi.org/10.1007/BF00756759