Large-N kinetic theory for highly occupied systems

• Verfasst von: Walz, Roland [VerfasserIn]
• Verfasst von: Boguslavski, Kirill [VerfasserIn]
• Verfasst von: Berges, Jürgen [VerfasserIn]
• Titel: Large-N kinetic theory for highly occupied systems
• Verf.angabe: R. Walz, K. Boguslavski, and J. Berges
• E-Jahr: 2018
• Jahr: 12 June 2018
• Umfang: 22 S.
• Fussnoten: Gesehen am 08.12.2020
• Titel Quelle: Enthalten in: Physical review
• Ort Quelle: Woodbury, NY : Inst., 2016
• Jahr Quelle: 2018
• Band/Heft Quelle: 97(2018,11) Artikel-Nummer 116011, 22 Seiten
• ISSN Quelle: 2470-0029
• DOI: doi:10.1103/PhysRevD.97.116011
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1584878347

Abstract

We consider an effective kinetic description for quantum many-body systems, which is not based on a weak-coupling or diluteness expansion. Instead, it employs an expansion in the number of field components N of the underlying scalar quantum field theory. Extending previous studies, we demonstrate that the large-N kinetic theory at next-to-leading order is able to describe important aspects of highly occupied systems, which are beyond standard perturbative kinetic approaches. We analyze the underlying quasiparticle dynamics by computing the effective scattering matrix elements analytically and solve numerically the large-N kinetic equation for a highly occupied system far from equilibrium. This allows us to compute the universal scaling form of the distribution function at an infrared nonthermal fixed point within a kinetic description, and we compare to existing lattice field theory simulation results.