Charged Scalar Self-Mass during Inflation

Abstract

We compute the one loop self-mass of a charged massless, minimally coupled scalar in a locally de Sitter background geometry. The computation is done in two different gauges: the noninvariant generalization of Feynman gauge which gives the simplest expression for the photon propagator and the de Sitter invariant gauge of Allen and Jacobson. In each case dimensional regularization is employed and fully renormalized results are obtained. By using our result in the linearized, effective field equations one can infer how the scalar responds to the dielectric medium produced by inflationary particle production. We also work out the result for a conformally coupled scalar. Although the conformally coupled case is of no great physical interest the fact that we obtain a manifestly de Sitter invariant form for its self-mass-squared establishes that our noninvariant gauge introduces no physical breaking of de Sitter invariance at one loop order.

41 pages, LaTeX 2epsilon, 3 figures, uses axodraw

References in corpus (6)

• Quantum effects can render w<-1 on cosmological scales
• Stochastic Quantum Gravitational Inflation
• A Leading Logarithm Approximation for Inflationary Quantum Field Theory
• Yukawa Scalar Self-Mass on a Conformally Flat Background
• Quantum Effects during Inflation
• Fermion Self-Energy during Inflation

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