Finite temperature spectral functions in the $O(N)$ model

• Verfasst von: Pawlowski, Jan M. [VerfasserIn]
• Verfasst von: Strodthoff, Nils [VerfasserIn]
• Verfasst von: Wink, Nicolas [VerfasserIn]
• Titel: Finite temperature spectral functions in the $O(N)$ model
• Verf.angabe: Jan M. Pawlowski, Nils Strodthoff, and Nicolas Wink
• E-Jahr: 2018
• Jahr: 9 October 2018
• Illustrationen: Illustrationen
• Fussnoten: Gesehen am 10.02.2020
• Titel Quelle: Enthalten in: Physical review
• Ort Quelle: Woodbury, NY : Inst., 2016
• Jahr Quelle: 2018
• Band/Heft Quelle: 98(2018,7) Artikel-Nummer 074008, Seite 1-12, 12 Seiten
• ISSN Quelle: 2470-0029
• DOI: doi:10.1103/PhysRevD.98.074008
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1689727004

Abstract

We directly calculate spectral functions in the O(N) model at finite temperature within the framework of the functional renormalization group. Special emphasis is put on a fully numerical framework involving four-dimensional regulators preserving Euclidean O(4) and Minkowski Lorentz invariance, an important prerequisite for future applications. Pion and sigma meson spectral functions are calculated for a wide range of temperatures across the phase transition illustrating the applicability of the general framework for finite temperature applications. In addition, various aspects concerning the interplay between the Euclidean and real-time two-point function are discussed.