Light speed variation from active galactic nuclei

Abstract

Recent studies on the high-energy photons from gamma-ray bursts~(GRBs) suggested a light speed variation $v(E)=c(1-E/E_{\mathrm{LV}})$ with $E_{\mathrm{LV}}=3.6\times 10^{17}$ GeV. We check this speed variation from previous observations on light curves of three active galactic nuclei (AGNs), namely Markarian 421 (Mrk 421), Markarian 501 (Mrk 501) and PKS 2155-304. We show that several phenomena related to the light curves of these AGNs can serve as the supports for the light speed variation determined from GRBs.

10 latex pages, 3 figures

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• Revisiting Lorentz invariance violation from GRB 221009A
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• Constraints to Lorentz violation and ultrahigh-energy electrons in D-foamy space-times
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