A variational principle for light rays i
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Volker Perlick
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Article
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2001
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Elsevier Science
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English
β 626 KB
We consider ray optics in a non-magnetized plasma on an arbitrary general-relativistic spacetime. We discuss a variational principle for light rays traveling, under the influence of the plasma, from a point \(x\) to a timelike curve \(\gamma\) and arriving at \(\gamma\) with a prescribed frequency.