Nonperturbative treatment of a quenched Langevin field theory
We present a novel approach within the functional renormalization group framework for computing critical exponents that characterize the time evolution of out-of-equilibrium many-body systems. Our approach permits access to quantities involved in the renormalization procedure, using an expansion abo...
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| Hauptverfasser: | , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
11 July 2025
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| In: |
Physical review
Year: 2025, Jahrgang: 112, Heft: 2, Pages: 1-13 |
| ISSN: | 2469-9969 |
| DOI: | 10.1103/x96k-tfrv |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/x96k-tfrv Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/x96k-tfrv 
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| Verfasserangaben: | Friederike Ihssen, Valerio Pagni, Jamir Marino, Sebastian Diehl, and Nicolò Defenu |
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| 245 | 1 | 0 | |a Nonperturbative treatment of a quenched Langevin field theory |c Friederike Ihssen, Valerio Pagni, Jamir Marino, Sebastian Diehl, and Nicolò Defenu |
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| 520 | |a We present a novel approach within the functional renormalization group framework for computing critical exponents that characterize the time evolution of out-of-equilibrium many-body systems. Our approach permits access to quantities involved in the renormalization procedure, using an expansion about time-translation invariant problems. This expansion can be upgraded to a fully time-dependent computation by iteration. As a prototypical example, we compute the aging exponent describing the dynamics of model A following a sudden quench to the critical point. Already at leading order, the approach demonstrates remarkable accuracy when compared with MC simulations and resummed perturbative expansions in the range 2<<4. This yields results that surpass those of the two-loop expansion in accuracy and match analytically known benchmarks at large . These findings contribute to a deeper understanding of out-of-equilibrium universality and open new avenues for nonperturbative studies of critical dynamics, as well as for exploring the critical behavior of systems with spatial boundaries. | ||
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| 700 | 1 | |a Defenu, Nicolò |e VerfasserIn |4 aut | |
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