Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1997-02-03
Phys.Rev. D56 (1997) 2265-2280
Physics
High Energy Physics
High Energy Physics - Theory
32 pages, no macros
Scientific paper
10.1103/PhysRevD.56.2265
Using the Schwinger-Keldysh technique we discuss how to derive the transport equations for the system of massless quantum fields. We analyse the scalar field models with quartic and cubic interaction terms. In the $\phi^4$ model the massive quasiparticles appear due to the self-interaction of massless bare fields. Therefore, the derivation of the transport equations strongly resembles that one of the massive fields, but the subset of diagrams which provide the quasiparticle mass has to be resummed. The kinetic equation for the finite width quasiparticles is found, where, except the mean-field and collision terms, there are terms which are absent in the standard Boltzmann equation. The structure of these terms is discussed. In the massless $\phi^3$ model the massive quasiparticles do not emerge and presumably there is no transport theory corresponding to this model. It is not surprising since the $\phi^3$ model is anyhow ill defined.
No associations
LandOfFree
Transport Theory of Massless Fields does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Transport Theory of Massless Fields, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Transport Theory of Massless Fields will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-223687