Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2007-02-08
J. Phys. A: Math. Theor. 40, 9969-9975 (2007)
Physics
Condensed Matter
Statistical Mechanics
4 pages,1 figure
Scientific paper
10.1088/1751-8113/40/33/002
We study the Casimir effect for a 3-d system of ideal Bose gas in a slab geometry with Dirichlet boundary condition. We calculate the temperature($T$) dependence of the Casimir force below and above the Bose-Einstein condensation temperature($T_c$). At $T\le T_c$ the Casimir force vanishes as $[\frac{T}{T_c}]^{3/2}$. For $T\gtrsim T_c$ it weakly depends on temperature. For $T\gg T_c$ it vanishes exponentially. At finite temperatures this force for thermalized photons in between two plates has a classical expression which is independent of $\hbar$. At finite temperatures the Casimir force for our system depends on $\hbar$.
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