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Speaker |
Tsupko, Oleg |
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Co-autors |
G. S. Bisnovatyi-Kogan |
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Talk Title |
Strong gravitational lensing and influence of plasma |
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Abstract |
When a gravitating body is surrounded by a plasma, the lensing angle depends on the frequency of the electromagnetic wave due to refraction properties, and the dispersion properties of light propagation in the plasma. The last effect leads to a frequency dependence, even in the uniform plasma, of the lensing angle, which resembles the properties of a refractive prism spectrometer. The strongest action of this spectrometer is for the frequencies slightly exceeding the plasma frequency, which corresponds to very long radiowaves. We discuss a possibility of observation of this effect by the planned VLBI space project Radioastron. We also consider the strong gravitational lensing by Schwarzschild black holes. |
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