| Authors | Ehsan Bavarsad- Sang Pyo Kim- Clément Stahl- She-Sheng Xue |
|---|---|
| Conference Title | Fifteenth Marcel Grossmann Meeting- MG15 |
| Holding Date of Conference | 2018-07-01~07 |
| Event Place | Rome-Italy |
| Presented by | University of Kashan |
| Page number | 2041-2046 |
| Presentation | SPEECH |
| Conference Level | International Conferences |
Abstract
In this proceeding we consider a massive charged scalar field in a uniform electric field background in a de Sitter spacetime (dS). We compute the in-vacuum expectation value of the trace of the energy-momentum tensor for the created Schwinger pairs, and using adiabatic subtraction scheme the trace is regularized. The effect of the Schwinger pair creation on the evolution of the Hubble constant is investigated. We find that the production of the semiclassical pairs leads to a decay of the Hubble constant. Whereas, the production of a light scalar field in the weak electric field regime leads to a superacceleration phenomenon.