Physics
Scientific paper
Aug 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975gregr...6..329b&link_type=abstract
General Relativity and Gravitation, Volume 6, Issue 4, pp.329-343
Physics
15
Scientific paper
We show that linearized gravitational radiation produces fluctuations in intensity and position of a distant source if the ray travels in a dispersive medium. The effect, however, depends upon the nongeodesic character of the ray and does not occur in an electrostatic plasma. When the index of refraction n is greater than unity a Cerenkov type resonance produces scintillation proportional to D O 3/2 (D O being the distance of the source) and a ‘dancing’ proportional to D O 1/2 if, instead, n<1 the scintillation behaves like D O and the dancing does not diverge as D O → ∞. The calculation is performed in detail for a random and isotropic spectrum of gravitational waves W(ω). This effect allows one to set an upper limit to W(ω) at the frequency at which the fluctuations are observed, but for the rarified interstellar and intergalactic plasmas these limits are not very interesting.
Bertotti Bruno
Catenacci Roberto
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