On the Casimir effect for parallel plates in the spacetime with one   extra compactified dimension
  In this paper, the Casimir effect for parallel plates in the presence of one compactified universal extra dimension is reexamined in detail. Having regularized the expressions of Casimir force, we show that the nature of Casimir force is repulsive if the distance between the plates is large enough, which is disagree with the experimental phenomena. 
Hongbo Cheng