Электронный каталог

Статья

Moreno-Armijos, M.A.
Observation of Relaxation Stages in a Nonequilibrium Closed Quantum System: Decaying Turbulence in a Trapped Superfluid / M.A.Moreno-Armijos, V.I.Yukalov, [a.o.] // Physical Review Letters [Electronic resource]. – 2025. – Vol. 134, No. 2. – P. 023401. – URL: https://doi.org/10.1103/PhysRevLett.134.023401.

The dynamics of nonequilibrium closed quantum systems and their route to thermalization are of fundamental interest to several fields, from cosmology to particle physics. However, a comprehensive description of nonequilibrium phenomena still presents a significant challenge. In this work, we report the observation of distinct stages during the relaxation of the decaying turbulence in trapped Bose-Einstein condensates. Our findings show a direct particle cascade from low to high momenta, a consequence of the energy injection in the system, exhibiting a characteristic universal scaling. This stage is followed by an inverse particle cascade responsible for repopulating the previously depleted condensate. Both cascades can be explained through self-similar solutions provided by wave turbulence theory. These findings provide important insights into the relaxation stages of out-of-equilibrium quantum many-body systems.



ОИЯИ = ОИЯИ (JINR)2025