Analytic continuation of functional renormalization group equations
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 s...
Gespeichert in:
| 1. Verfasser: | |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
07 May 2012
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| In: |
Journal of high energy physics
Year: 2012, Heft: 5, Pages: 1-34 |
| ISSN: | 1029-8479 |
| DOI: | 10.1007/JHEP05(2012)021 |
| Online-Zugang: | Verlag, kostenfrei, Volltext: http://dx.doi.org/10.1007/JHEP05(2012)021 Verlag, kostenfrei, Volltext: https://link.springer.com/article/10.1007/JHEP05(2012)021 
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| Verfasserangaben: | Stefan Floerchinger |
MARC
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| 520 | |a 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. | ||
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