We consider a gas of n bosonic particles confined in a box [−ℓ/2,ℓ/2]3 with Neumann boundary conditions. We prove Bose–Einstein condensation in the Gross–Pitaevskii regime, with an optimal bound on the condensate depletion. Moreover, our lower bound for the ground state energy in a small box [−ℓ/2,ℓ/2]3 implies (via Neumann bracketing) a lower bound for the ground state energy of N bosons in a large box [−L/2,L/2]3 with density ρ=N/L3 in the thermodynamic limit.

The Bose gas in a box with Neumann boundary conditions / C. Boccato, R. Seiringer. - In: ANNALES HENRI POINCARE'. - ISSN 1424-0637. - (2023), pp. 1-56. [Epub ahead of print] [10.1007/s00023-022-01252-3]

The Bose gas in a box with Neumann boundary conditions

C. Boccato
Primo
;
2023

Abstract

We consider a gas of n bosonic particles confined in a box [−ℓ/2,ℓ/2]3 with Neumann boundary conditions. We prove Bose–Einstein condensation in the Gross–Pitaevskii regime, with an optimal bound on the condensate depletion. Moreover, our lower bound for the ground state energy in a small box [−ℓ/2,ℓ/2]3 implies (via Neumann bracketing) a lower bound for the ground state energy of N bosons in a large box [−L/2,L/2]3 with density ρ=N/L3 in the thermodynamic limit.
Settore MAT/07 - Fisica Matematica
2023
7-gen-2023
https://link.springer.com/article/10.1007/s00023-022-01252-3
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/931712
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