2002/07/05 by Antal Jakovác, A. Jakovac · 1 citation
Physics and Astronomy · #High-Energy Particle Collisions Research #Statistical Mechanics and Entropy #Theoretical and Computational Physics #hep-ph
paper · pdf · doi:10.1103/physrevd.66.125003
published as Phys.Rev. D66 (2002) 125003 · 22 pages, latex, 2 ps figures
arxiv created 2002/07/05 · openalex publication_date 2002/12/11 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
A novel refinement of the conventional treatment of Kadanoff-Baym equations is suggested. In addition to the Boltzmann equation, another differential equation is used for calculating the evolution of the nonequilibrium two-point function. Although it was usually interpreted as a constraint on the solution of the Boltzmann equation, we argue that its dynamics is relevant to the determination and resummation of the particle production cut contributions. The differential equation for this new contribution is illustrated in the example of the cubic scalar model. The analogue of the relaxation time approximation is suggested. It results in the shift of the threshold location and in a smearing out of the nonanalytic threshold behavior of the spectral function. The possible consequences for the dilepton production are discussed.