Bogolyubov approximation for diagonal model of an interacting Bose gas |
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Authors: | M Corgini DP Sankovich |
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Institution: | 1. Departamento de Matemáticas, Universidad de La Serena, Cisternas 1200, La Serena, Chile;2. V.A. Steklov Mathematical Institute, Gubkin str. 8, 119991 Moscow, Russia |
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Abstract: | We study, using the Bogolyubov approximation, the thermodynamic behavior of a superstable Bose system whose energy operator in the second-quantized form contains a nonlinear expression in the occupation numbers operators. We prove that for all values of the chemical potential satisfying μ>λ(0), where λ(0)?0 is the lowest energy value, the system undergoes Bose–Einstein condensation. |
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Keywords: | 05 30 Jp 03 75 Hh 64 60 Cn |
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