Exact renormalization group and [phi]-derivable approximations
We show that the so-called Phi-derivable approximations can be combined with the exact renormalization group to provide efficient non-perturbative approximation schemes. On the one hand, the Phi-derivable approximations allow for a simple truncation of the infinite hierarchy of the renormalization g...
Gespeichert in:
| Hauptverfasser: | , , |
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| Dokumenttyp: | Article (Journal) Kapitel/Artikel |
| Sprache: | Englisch |
| Veröffentlicht: |
2010
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| In: |
Arxiv
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| Online-Zugang: | Verlag, kostenfrei, Volltext: http://arxiv.org/abs/1009.6048
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| Verfasserangaben: | Jean-Paul Blaizot, Institut de Physique Théorique, CEA-Saclay, 91191 Gif-sur-Yvette Cedex, France; Jan M. Pawlowski, Institut für Theoretische Physik, University of Heidelberg, Philosophenweg 16, 69120 Heidelberg, Germany; Urko Reinosa, Centre de Physique Théorique, Ecole Polytechnique, CNRS, 91128 Palaiseau Cedex, France. |
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| 245 | 1 | 0 | |a Exact renormalization group and [phi]-derivable approximations |c Jean-Paul Blaizot, Institut de Physique Théorique, CEA-Saclay, 91191 Gif-sur-Yvette Cedex, France; Jan M. Pawlowski, Institut für Theoretische Physik, University of Heidelberg, Philosophenweg 16, 69120 Heidelberg, Germany; Urko Reinosa, Centre de Physique Théorique, Ecole Polytechnique, CNRS, 91128 Palaiseau Cedex, France. |
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| 520 | |a We show that the so-called Phi-derivable approximations can be combined with the exact renormalization group to provide efficient non-perturbative approximation schemes. On the one hand, the Phi-derivable approximations allow for a simple truncation of the infinite hierarchy of the renormalization group flow equations. On the other hand, the flow equations turn the non linear equations that derive from the Phi-derivable approximations into an initial value problem, offering new practical ways to solve these equations. | ||
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