The Plasmon in Hot φ4 Theory
Abstract
We study the 2-loop resummed propagator in hot g2φ4 theory. The propagator has a cut along the whole real axis in the complex energy plane, but for small g, the spectral density is sharply peaked around the plasmon. The dispersion relation and the width of the plasmon are calculated at zero and finite momentum. At large momenta the spectral width vanishes, and the plasmon looses its collectivity and behaves like a non-interacting free particle.
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