GL3 - Gravitational lensing: theory and numerical modeling |
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Speaker |
Bozza, Valerio |
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Coauthors |
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| Talk Title |
Gravitational lensing by black holes and the case of Sgr A* |
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Abstract |
Light rays passing close to a black hole experience very strong deflections and can give rise to infinite sequences of images for any given source. We show how these images can be analytically described for any kinds of static or rotating metrics. In the case of Kerr metric, caustics become larger and larger for higher orders, and an exponentially large number of higher order images arises. We discuss how these results have been used in the popular movie "Interstellar". Some perspectives for observations of the strong deflection phenomenology come from the black hole in the Galactic center, where high resolution observational efforts are being concentrated. |
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