%0 Journal Article
%A Bavarsad, E
%A Mortezazadeh, M
%T Trace of energy-momentum tensor and gravitational backreaction of Schwinger scalars in 3D de Sitter spacetime
%J Iranian Journal of Physics Research
%V 18
%N 1
%U http://ijpr.iut.ac.ir/article-1-2465-en.html
%R 10.29252/ijpr.18.1.91
%D 2018
%K de Sitter spacetime, Scalar field, Schwinger effect, trace of energy-momentum tensor, Adiabatic subtraction regularization,
%X In this paper, we consider a massive charged scalar field coupled to a uniform electric field background in a 3 dimensional de Sitter spacetime. We consider the value of the dimensionless coupling constant of the scalar field to the scalar curvature of a 3 dimensional de Sitter spacetime equal to 1/8. We compute the expectation value of the trace of the energy-momentum tensor in the in-vacuum state and we show that using adiabatic subtraction regularization method the linear ultraviolet divergence is removed and a finite expression obtain. We investigate the behavior of the regularized trace for different intensities of the scalar field mass and the electric field. We show that the trace as a function of the electric field has a discontinuity at which it changes the sign. We show that for the case of a conformally coupled scalar field to the de Sitter spacetime the trace vanishes, and there is no trace anomaly. We discuss the gravitational backreaction effect of the created Schwinger pairs.
%> http://ijpr.iut.ac.ir/article-1-2465-en.pdf
%P 91-103
%& 91
%!
%9 Research
%L A-10-3043-1
%+ University of Kashan
%G eng
%@ 1682-6957
%[ 2018