AU - Bavarsad, E
AU - Mortezazadeh, M
TI - Trace of energy-momentum tensor and gravitational backreaction of Schwinger scalars in 3D de Sitter spacetime
PT - JOURNAL ARTICLE
TA - IJPR
JN - IJPR
VO - 18
VI - 1
IP - 1
4099 - http://ijpr.iut.ac.ir/article-1-2465-en.html
4100 - http://ijpr.iut.ac.ir/article-1-2465-en.pdf
SO - IJPR 1
ABĀ - 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.
CP - IRAN
IN - Department of Physics, University of Kashan, Kashan, Iran
LG - eng
PB - IJPR
PG - 91
PT - Research
YR - 2018