Phys. Rev. D 78, 103003 (2008) [5 pages]γ-ray polarization constraints on Planck scale violations of special relativityReceived 31 August 2008; published 5 November 2008 Using recent polarimetric observations of the Crab Nebula in the hard X-ray band by INTEGRAL, we show that the absence of vacuum birefringence effects constrains O(E/M) Lorentz violation in QED to the level |ξ|<9×10-10 at 3σ CL, tightening by more than 3 orders of magnitude previous constraints. We show that planned X-ray polarimeters have the potential to probe |ξ|∼10-16 by detecting polarization in active galaxies at red-shift ∼1. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.78.103003
DOI:
10.1103/PhysRevD.78.103003
PACS:
98.70.Qy, 04.60.Bc, 11.30.Cp, 95.30.Gv
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