The scalar particle production from vacuum in the presence of electric field,on the de Sitter spacetime is studied. We use perturbation methods to definethe transition amplitude. We obtain that the momentum is not conserved in thisprocess. The probability of pair production is computed by squaring thetransition amplitude. Our graphical representations shows that, the probabilityof scalar particle production was important only in early stage of theuniverse, when the Hubble's constant was very large in comparison with the massof the particle. Also we propose here a criteria of particle-antiparticleseparation.
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