TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhys.14.2.011
TI  - Equal-time approach to real-time dynamics of quantum fields
PY  - 2023/02/01
UR  - https://scipost.org/SciPostPhys.14.2.011
JF  - SciPost Physics
JA  - SciPost Phys.
VL  - 14
IS  - 2
SP  - 011
A1  - Ott, Robert
AU  - Zache, Torsten V.
AU  - Berges, Jürgen
AB  - 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.
ER  -

@Article{10.21468/SciPostPhys.14.2.011,
	title={{Equal-time approach to real-time dynamics of quantum fields}},
	author={Robert Ott and Torsten V. Zache and Jürgen Berges},
	journal={SciPost Phys.},
	volume={14},
	pages={011},
	year={2023},
	publisher={SciPost},
	doi={10.21468/SciPostPhys.14.2.011},
	url={https://scipost.org/10.21468/SciPostPhys.14.2.011},
}