Repulsive electromagnetic stresses in the Casimir piston

L. García, L. E. González, M. Lomnitz, C. Villarreal

Published 2008-10-14, updated 2008-10-25Version 2

This manuscript has been withdrawn, since the authors have detected numerical inaccuracies that invalidate their main results concerning the existence of repulsive Casimir forces within a rectangular piston. Formulas presented in the manuscript keep still valid. The authors deeply apologize for this mistake.