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In this article, we consider the finite temperature Casimir effect inKaluza-Klein spacetime due the the vacuum fluctuation of massless scalar fieldwith Dirichlet boundary conditions. We consider the general case where theextra dimensions (internal space) can be any compact connected manifold ororbifold without boundaries. Using piston analysis, we show that the Casimirforce is always attractive at any temperature, regardless of the geometry ofthe internal space. Moreover, the magnitude of the Casimir force increases asthe size of the internal space increases and it reduces to the Casimir force in(3+1)-dimensional Minskowski spacetime when the size of the internal spaceshrinks to zero. In the other extreme where the internal space is large, theCasimir force can increase beyond all bound. Asymptotic behaviors of theCasimir force in the low and high temperature regimes are derived and it isobserved that the magnitude of the Casimir force grows linearly withtemperature in the high temperature regime.

Finite Temperature Casimir Effect in Kaluza-Klein Spacetime