New Limits on Planck Scale Lorentz Violation (Floyd Stecker)

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http://arxiv.org/abs/1102.2784
New Limits on Planck Scale Lorentz Violation from Gamma-ray Burst Polarization
Floyd W. Stecker
3 pages, submitted to Phys. Rev. Letters
(Submitted on 14 Feb 2011)
"Constraints on possible Lorentz invariance violation to first order in E/M_{Planck} for photons in the framework of effective field theory are discussed. Using the detection of polarized soft gamma-ray emission from the gamma-ray burst GRB041219a that indicates the absence of vacuum birefringence, together with a method for estimating the redshift of the burst, we improve the previous constraints on the dimension 5 Lorentz violating modification to the Lagrangian of an effective local QFT for QED by 4 orders of magnitude."

Nice to see the situation here getting increasingly clear.
 

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