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De Finetti theorems, mean-field limits and Bose-Einstein condensation
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De Finetti theorems, mean-field limits and Bose-Einstein condensation
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These notes deal with the mean-field approximation for equilibrium states of N-body systems in classical and quantum statistical mechanics. A general strategy for the justification of effective models based on statistical independence assumptions is presented in details. The main tools are structure theorems {\`a} la de Finetti, describing the large N limits of admissible states for these systems. These rely on the symmetry under exchange of particles, due to their indiscernability. Emphasis is put on quantum aspects, in particular the mean-field approximation for the ground states of large bosonic systems, in relation with the Bose-Einstein condensation phenomenon. Topics covered in details include: the structure of reduced density matrices for large bosonic systems, Fock-space localization methods, derivation of effective energy functionals of Hartree or non-linear Schr{\"o}dinger type, starting from the many-body Schr{\"o}dinger Hamiltonian.
Forward citations
Cited by 2 Pith papers
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Exponential de Finetti Theorems for Fermionic Gaussian States
Subsystems of permutation-invariant fermionic Gaussian states are exponentially well approximated by mixtures of almost-i.i.d. states, and all Gaussian-invariant states admit Gaussian-symmetric purifications.
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Semi-classical limit of an attractive Fermi gas in one or two dimensions
For trapped attractive Fermi gases in 1D and 2D, as N grows the ground-state energy approaches the Thomas-Fermi energy, and ground states converge via Husimi functions.
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