Bose-Einstein Condensates in Atomic Gases: Simple Theoretical Results
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In low-dimensional geometries, a general condition for mean-field validity is that the characteristic kinetic energy exceeds the interaction energy, ε_kin ≫ ε_int, equivalently n ξ^d ≫ 1.
“a quite general formulation involves the characteristic kinetic and interaction energies, ε kin = ħ 2 n 2/d /2m ≫ ε int = g nl n or, equivalently, the number of particles per healing length, nξ d ≫ 1”
From How to exploit driving and dissipation to stabilize and manipulate quantum many-body states (2025) · cites this paper as [74]
Section 9.2 (p. 132–133) gives a one-dimensional condition for the Born approximation and relates it to a large particle number in the condensate, lending some support to a weak-interaction criterion for mean-field treatment. The copy does not state the claimed general low-dimensional criterion ε_kin ≫ ε_int or its equivalence to nξ^d ≫ 1. Section 5.3.4 (p. 60–61) defines the healing length, but applies it to a different validity condition for classical hydrodynamics. (LLM, conf=0.76)
Experimental — accuracy not yet measuredFor three-dimensional dilute Bose-Einstein condensates, the mean-field approach is valid when the diluteness parameter n_3d a_sc^3 is much less than 1.
“for three-dimensional gases, the condition can be expressed in terms of a diluteness condition n 3d a 3 sc ≪ 1, where n 3d is the three-dimensional density and a sc is the atom-atom collisional scattering length”
From How to exploit driving and dissipation to stabilize and manipulate quantum many-body states (2025) · cites this paper as [74]
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How to exploit driving and dissipation to stabilize and manipulate quantum many-body states
Carusotto, I. (2025) · Comptes Rendus. Physique · doi:10.5802/crphys.258 · Cited by 5 · see citing works
“…the factorization approximation gives the usual Gross-Pitaevskii equation for an interacting Bose-Einstein condensate, Necessary conditions for the validity of this mean-field approach can be obtained from the general many-body theory of dilute Bose-Einstein condensates at equilibrium [1, 52].”
- Authors
- Castin, Y.
- Affiliations
- Laboratoire Kastler Brossel (FR)
- Corresponding author
- Castin, Y.
- Venue
- Les Houches - Ecole d’Ete de Physique Theorique
- Publisher
- Springer Berlin Heidelberg
- Published
- 2007-07-02
- Volume
- 72
- Pages
- 1-136
- OpenAlex
- W1642381609
- Cited by
- 102
- References
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- 2026: 2 · 2025: 3 · 2024: 3 · 2023: 4 · 2022: 7 · 2021: 9 · 2020: 3 · 2019: 4 · 2018: 6 · 2017: 7 · 2016: 4 · 2015: 5 · 2014: 3 · 2013: 5 · 2012: 3
- FWCI
- 34.31
- Type
- book chapter
- Language
- en
- Open access
- green
- arxiv.org
- Locations
- Springer eBooks (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- HAL (submittedVersion)
- arXiv (Cornell University)
- Topics
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Cold Atom Physics and Bose-Einstein Condensates
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Strong Light-Matter Interactions
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum, superfluid, helium dynamics
- Keywords
- Bose-Einstein condensate, ideal Bose gas, critical temperature, thermal de Broglie wavelength, Riemann zeta function, thermodynamic limit, phase transitions, non-interacting bosons, periodic boundary conditions
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