  In this paper we investigate the Bose-Einstein condensation of massive spin-1
particles in an Einstein universe. The system is considered under relativistic
conditions taking into consideration the possibility of particle-antiparticle
pair production. An exact expression for the charge density is obtained, then
certain approximations are employed in order to obtain the solutions in closed
form. A discussion of the approximations employed in this and other work is
given. The effects of finite-size and spin-curvature coupling are emphasized.
