| Authors | Ehsan Bavarsad-Leila Jafari Robattorki |
|---|---|
| Conference Title | National Conference on Gravity and Cosmology 96 |
| Holding Date of Conference | 2018-01-24~25 |
| Event Place | Isfahan-Iran |
| Presented by | University of Kashan |
| Page number | 66-69 |
| Presentation | POSTER |
| Conference Level | National Conferences |
Abstract
In this paper, we compute the regularized in-vacuum expectation value of the trace of the energy-momentum tensor of a massive charged scalar field in a uniform electric field background with a nonminimal coupling to the scalar curvature of a 2 dimensional de Sitter spacetime. We find that, in the case of a massless scalar field the trace is independent of the electric field. In the case of a massive scalar field, for the small positive values of the nonminimal coupling the sign of the trace changes. Whereas, for the large enough negative values of the nonminimal coupling the trace is positive.