A first comparison of Kinetic Field Theory with Eulerian Standard Perturbation Theory

• Verfasst von: Kozlikin, Elena [VerfasserIn]
• Verfasst von: Lilow, Robert [VerfasserIn]
• Verfasst von: Fabis, Felix [VerfasserIn]
• Verfasst von: Bartelmann, Matthias [VerfasserIn]
• Titel: A first comparison of Kinetic Field Theory with Eulerian Standard Perturbation Theory
• Verf.angabe: Elena Kozlikin, Robert Lilow, Felix Fabis and Matthias Bartelmann
• E-Jahr: 2021
• Jahr: 17 June 2021
• Umfang: 32 S.
• Teil: year:2021
• Teil: number:6
• Teil: elocationid:035
• Teil: pages:1-32
• Teil: extent:32
• Titel Quelle: Enthalten in: Journal of cosmology and astroparticle physics
• Ort Quelle: London : IOP, 2003
• Jahr Quelle: 2021
• Band/Heft Quelle: (2021), 6, Artikel-ID 035, Seite 1-32
• ISSN Quelle: 1475-7516
• DOI: doi:10.1088/1475-7516/2021/06/035
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1774374706

Abstract

We present a detailed comparison of the newly developed particle-based Kinetic Field Theory framework for cosmic large-scale structure formation with the established formalism of Eulerian Standard Perturbation Theory. We highlight the qualitative differences of both approaches by a comparative analysis of the respective equations of motion and implementation of initial conditions. A natural starting point for a first quantitative comparison is given by the non-interacting regime of free-streaming kinematics. Our results suggest that Kinetic Field Theory contains a complete resummation of Standard Perturbation Theory in this regime. We further show that the exact free-streaming solution of Kinetic Field Theory cannot be recovered in any finite order of Standard Perturbation Theory. Kinetic Field Theory should therefore provide a better starting point for perturbative treatments of non-linear structure formation.