https://hal-iogs.archives-ouvertes.fr/hal-01422001Bouchoule, IsabelleIsabelleBouchouleLaboratoire Charles Fabry / Optique atomique - LCF - Laboratoire Charles Fabry - UP11 - Université Paris-Sud - Paris 11 - IOGS - Institut d'Optique Graduate School - CNRS - Centre National de la Recherche ScientifiqueSzigeti, SSSzigetiSchool of Mathematics and Physics [Brisbane] - University of Queensland [Brisbane]Davis, MMDavisUniversity of Utah, Department of BiologyKheruntsyan, KKKheruntsyanSchool of Mathematics and Physics [Brisbane] - University of Queensland [Brisbane]Finite-temperature hydrodynamics for one-dimensional Bose gases: Breathing-mode oscillations as a case studyHAL CCSD2016[PHYS.COND.GAS] Physics [physics]/Condensed Matter [cond-mat]/Quantum Gases [cond-mat.quant-gas]Bouchoule, Isabelle2016-12-23 13:32:332023-02-08 17:11:002017-01-02 16:57:30enJournal articleshttps://hal-iogs.archives-ouvertes.fr/hal-01422001/document10.1103/PhysRevA.94.051602application/pdf1We develop a finite-temperature hydrodynamic approach for a harmonically trapped one-dimensional quasi-condensate and apply it to describe the phenomenon of frequency doubling in the breathing-mode oscillations of the quasicondensate momentum distribution. The doubling here refers to the oscillation frequency relative to the oscillations of the real-space density distribution, invoked by a sudden confinement quench. By constructing a nonequilibrium phase diagram that characterises the regime of frequency doubling and its gradual disappearance , we find that this crossover is governed by the quench strength and the initial temperature, rather than by the equilibrium-state crossover from the quasicondensate to the ideal Bose gas regime. The hydrodynamic predictions are supported by the results of numerical simulations based on a finite-temperature c-field approach, and extend the utility of the hydrodynamic theory for low-dimensional quantum gases to the description of finite-temperature systems and their dynamics in momentum space.