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In this proceeding we consider a massive charged scalar field in a uniformelectric field background in a de~Sitter spacetime (dS). We compute thein-vacuum expectation value of the trace of the energy-momentum tensor for thecreated Schwinger pairs, and using adiabatic subtraction scheme the trace isregularized. The effect of the Schwinger pair creation on the evolution of theHubble constant is investigated. We find that the production of thesemiclassical pairs leads to a decay of the Hubble constant. Whereas, theproduction of a light scalar field in the weak electric field regime leads to asuperacceleration phenomenon.

Effect of Schwinger pair production on the evolution of the Hubble constant in de~Sitter spacetime