Equal-time approach to real-time dynamics of quantum fields
We employ the equal-time formulation of quantum field theory to derive effective kinetic theories, first for a weakly coupled non-relativistic Bose gas, and then for a strongly correlated system of self-interacting N-component fields. Our results provide the link between state-of-the-art measurement...
Gespeichert in:
| Hauptverfasser: | , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
01-02-2023
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| In: |
SciPost physics
Year: 2023, Jahrgang: 14, Heft: 2, Pages: 1-29 |
| ISSN: | 2542-4653 |
| DOI: | 10.21468/SciPostPhys.14.2.011 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.21468/SciPostPhys.14.2.011 Verlag, lizenzpflichtig, Volltext: https://scipost.org/10.21468/SciPostPhys.14.2.011 
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| Verfasserangaben: | Robert Ott, Torsten V. Zache and Jürgen Berges |
MARC
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| 520 | |a We employ the equal-time formulation of quantum field theory to derive effective kinetic theories, first for a weakly coupled non-relativistic Bose gas, and then for a strongly correlated system of self-interacting N-component fields. Our results provide the link between state-of-the-art measurements of equal-time effective actions using quantum simulator platforms, as employed in [Phys. Rev. X 10, 011020 (2020); Nat. Phys. 16, 1012 (2020)], and observables underlying effective kinetic or hydrodynamic descriptions. New non-perturbative approximation schemes can be developed and certified this way, where the a priori time-local formulation of the equal-time effective action has crucial advantages over the conventional closed-time-path approach which is non-local in time. | ||
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