Analytic continuation of functional renormalization group equations

• Verfasst von: Flörchinger, Stefan [VerfasserIn]
• Titel: Analytic continuation of functional renormalization group equations
• Verf.angabe: Stefan Floerchinger
• E-Jahr: 2012
• Jahr: 07 May 2012
• Umfang: 34 S.
• Fussnoten: Gesehen am 27.11.2017
• Titel Quelle: Enthalten in: Journal of high energy physics
• Ort Quelle: Berlin : Springer, 1997
• Jahr Quelle: 2012
• Band/Heft Quelle: (2012), 5, Artikel-ID 21, Seite 1-34
• ISSN Quelle: 1029-8479
• DOI: doi:10.1007/JHEP05(2012)021
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1565747623

Abstract

Functional renormalization group equations are analytically continued from imaginary Matsubara frequencies to the real frequency axis. On the example of a scalar field with OO \mathcal{O} (N) symmetry we discuss the analytic structure of the flowing action and show how it is possible to derive and solve flow equations for real-time properties such as propagator residues and particle decay widths. The formalism conserves space-time symmetries such as Lorentz or Galilei invariance and allows for improved, self-consistent approximations in terms of derivative expansions in Minkowski space.