1,012 research outputs found
On the renormalization of CPT/Lorentz violating QED in curved space
We consider the one-loop renormalization of QED in curved space-time with
additional Lorentz and/or CPT breaking terms. The renormalization group
equations in the vacuum sector are derived. In the special case of Minkowski
metric and with constant Lorentz and CPT breaking terms these equations reduce
to the ones obtained earlier by other authors. The necessary form of the vacuum
counterterms indicate possible violations of the space or time homogeneity or
space isotropy in the gravitational phenomena. However, the necessity of the
phenomenologically most interesting terms such as linear in the space-time
curvature or torsion, is related to the non-constant nature of the
dimensionless Lorentz and CPT breaking parameters.Comment: 11 pages, LaTeX file. Minor improvements and new references added.
Accepted in Physics Letters
The Lorentz and CPT violating effects on the Z\to l^+ l^- decay
We study the Lorentz and CPT violating effects on the branching ratio BR, the
CPT violating asymmetry A_{CPT} and the ratio of the decay width, including
only the Lorentz violating effects, to the one obtained in the standard model,
for the flavor dependent part of the lepton flavor conserving Z\to l^+ l^-
(l=e,\mu,\tau) decay. The inclusion of the Lorentz and CPT violating effects to
the standard model contribution is too small to be detected, since the
corresponding coefficients are highly suppressed at the low energy scale.Comment: 11 pages, 6 figure
Comments on Lorentz and CPT Violation
This contribution to the CPT'13 meeting briefly introduces Lorentz and CPT
violation and outlines two recent developments in the field.Comment: 4 pages, presented at the Sixth Meeting on CPT and Lorentz Symmetry,
Bloomington, Indiana, June 17-21, 201
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