One-loop structure of the photon propagator in the Standard Model Extension

Abstract

We study radiative corrections on the photon propagator from the electroweak sector of the minimal Lorentz- and $CPT$-violating Standard Model Extension. We derive the most general Lorentz-violating ghost sector from BRST symmetry and renormalization theory. We introduce a Lorentz-violating nonlinear gauge that simplifies both the Higgs and gauge-sector extensions, which can be helpful in radiative corrections. At one loop, these sectors contribute to the $CPT$-even part of the photon propagator, characterized by the Riemann-type tensor $(k_F{)}_{\alpha \beta \mu \nu }$. We give exact results for the contributions to the SO(1,3) irreducible parts of $(k_F{)}_{\alpha \beta \mu \nu }$, namely, the Weyl-type tensor $({\hat{k}}_F{)}_{\alpha \beta \mu \nu }$, the Ricci-type tensor $(k_F{)}_{\alpha \beta }$, and the curvature-type scalar $k_F$. In the Yukawa sector, one-loop contributions are ultraviolet finite, but most of them are unobservable due to finite renormalization. The only observable effect is a contribution proportional to $(k_F{)}_{\alpha \beta }$ that emerges via a dimension-6 term that is observer and gauge invariant. In the Higgs and gauge sectors, all the irreducible parts of the corresponding Riemann-type tensors receive divergent contributions, so they are observable. The only finite contribution corresponds to the dimension-6 term. We think of these contributions as radiative corrections to the renormalized tensors and assume that both effects are of the same order of magnitude to find bounds from vacuum birefringence and compare with the literature. Bounds on $(k_F{)}_{\alpha \beta }$ contributions, innocuous to birefringence, are also derived using limits on the renormalized tensor from Laser-Interferometer-Gravitational-Wave-Observatory data. We compare these bounds with the literature. Beta functions associated with $({\hat{k}}_F{)}_{\alpha \beta \mu \nu }$ and $(k_F{)}_{\alpha \beta }$ are derived.

arXiv commentAccepted for publication in Physical Review D, 33 pages, 5 figures

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