TY - JOUR
T1 - Trace of energy-momentum tensor and gravitational backreaction of Schwinger scalars in 3D de Sitter spacetime
TT - رد تانسور انرژی- تکانه و پسزنی گرانشی اسکالرهای شوینگر در فضازمان دوسیته سهبعدی
JF - IJPR
JO - IJPR
VL - 18
IS - 1
UR - http://ijpr.iut.ac.ir/article-1-2465-en.html
Y1 - 2018
SP - 91
EP - 103
KW - de Sitter spacetime
KW - Scalar field
KW - Schwinger effect
KW - trace of energy-momentum tensor
KW - Adiabatic subtraction regularization
N2 - 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.
M3 10.29252/ijpr.18.1.91
ER -