Dynamics of mean-field bosons at positive temperature
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arXiv
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| Format: | Preprint |
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2022
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| _version_ | 1866916723830030336 |
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| author | Caporaletti, Marco Deuchert, Andreas Schlein, Benjamin |
| author_facet | Caporaletti, Marco Deuchert, Andreas Schlein, Benjamin |
| contents | We study the time evolution of an initially trapped weakly interacting Bose gas at positive temperature, after the trapping potential has been switched off. It has been recently shown in arXiv:2009.00992 that the one-particle density matrix of Gibbs states of the interacting trapped gas is given, to leading order in $N$, as $N \to \infty$, by the one of the ideal gas, with the condensate wave function replaced by the minimizer of the Hartree energy functional. We show that this structure is stable with respect to the many-body evolution in the following sense: the dynamics can be approximated in terms of the time-dependent Hartree equation for the condensate wave function and in terms of the free evolution for the thermally excited particles. The main technical novelty of our work is the use of the Hartree-Fock-Bogoliubov equations to define a fluctuation dynamics. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2203_17204 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Dynamics of mean-field bosons at positive temperature Caporaletti, Marco Deuchert, Andreas Schlein, Benjamin Mathematical Physics 82C10, 81V70, 35Q40, 35Q55 We study the time evolution of an initially trapped weakly interacting Bose gas at positive temperature, after the trapping potential has been switched off. It has been recently shown in arXiv:2009.00992 that the one-particle density matrix of Gibbs states of the interacting trapped gas is given, to leading order in $N$, as $N \to \infty$, by the one of the ideal gas, with the condensate wave function replaced by the minimizer of the Hartree energy functional. We show that this structure is stable with respect to the many-body evolution in the following sense: the dynamics can be approximated in terms of the time-dependent Hartree equation for the condensate wave function and in terms of the free evolution for the thermally excited particles. The main technical novelty of our work is the use of the Hartree-Fock-Bogoliubov equations to define a fluctuation dynamics. |
| title | Dynamics of mean-field bosons at positive temperature |
| topic | Mathematical Physics 82C10, 81V70, 35Q40, 35Q55 |
| url | https://arxiv.org/abs/2203.17204 |