I was just looking at an expression (a dispersion relation, omega^2 = ...) similar to that of warm electron's in a plasma http://en.wikipedia.org/wiki/Plasma_oscillation expect with an extra imaginary term, which I think comes out from the full derivation of the dispersion relation for warm electrons. I am guessing the relation that everybody knows of is then the Real part of the expression I was looking at.(adsbygoogle = window.adsbygoogle || []).push({});

My question is, can a purely imaginary term have some physical significance? Surely it isn't physical?

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# Langmuir waves dispersion relation

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