Large-N kinetic theory for highly occupied systems
We consider an effective kinetic description for quantum many-body systems, which is not based on a weak-coupling or diluteness expansion. Instead, it employs an expansion in the number of field components N of the underlying scalar quantum field theory. We demonstrate that the large-N kinetic theor...
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| Hauptverfasser: | , , |
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| Dokumenttyp: | Article (Journal) Kapitel/Artikel |
| Sprache: | Englisch |
| Veröffentlicht: |
30 Oct 2017
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| In: |
Arxiv
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| Online-Zugang: | Verlag, kostenfrei, Volltext: http://arxiv.org/abs/1710.11146
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| Verfasserangaben: | R. Walz, K. Boguslavski, and J. Berges |
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| 520 | |a We consider an effective kinetic description for quantum many-body systems, which is not based on a weak-coupling or diluteness expansion. Instead, it employs an expansion in the number of field components N of the underlying scalar quantum field theory. We demonstrate that the large-N kinetic theory at next-to-leading order is able to describe important aspects of highly occupied systems, which are beyond standard perturbative kinetic approaches. We analyze the underlying quasiparticle dynamics and solve the large-N kinetic equation for a highly occupied system far from equilibrium. This allows us to compute universal self-similar properties at nonthermal fixed points, including the infrared scaling form of the distribution function. | ||
| 650 | 4 | |a High Energy Physics - Phenomenology | |
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