The Plasmon in Hot $φ^4$ Theory

Details The Plasmon in Hot $φ^4$ Theory The Plasmon in Hot $φ^4$ Theory

1995-09-19

arxiv.org/abs/hep-ph/9509333v1

Phys.Rev.D53:899-910,1996

Physics

High Energy Physics

High Energy Physics - Phenomenology

REVTeX, 30 pages, 8 uuencoded ps-figures

Scientific paper

10.1103/PhysRevD.53.899

We study the 2-loop resummed propagator in hot $g^2\phi^4$ 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 {\em 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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