We exploit recent polarimetric observations of the Crab Nebula in the hard X-ray band by IN- TEGRAL to 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). This tightens by more than three or- ders of magnitude previous constraints. We also show that planned X-ray polarimeters have the potential to probe |ξ | ∼ 10^{−16} by detecting polarization in active galaxies at red-shift ∼ 1.
Gamma-ray polarization constraints on Planck scale violations of special relativity / Maccione, L.; Liberati, S.; Celotti, A.; Kirk, J. G.; Ubertini, P.. - In: POS PROCEEDINGS OF SCIENCE. - ISSN 1824-8039. - 78:(2008), pp. 1-6. [10.22323/1.078.0018]
Gamma-ray polarization constraints on Planck scale violations of special relativity
Liberati, S.;Celotti, A.;
2008-01-01
Abstract
We exploit recent polarimetric observations of the Crab Nebula in the hard X-ray band by IN- TEGRAL to 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). This tightens by more than three or- ders of magnitude previous constraints. We also show that planned X-ray polarimeters have the potential to probe |ξ | ∼ 10^{−16} by detecting polarization in active galaxies at red-shift ∼ 1.| File | Dimensione | Formato | |
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