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The Large High Altitude Air Shower Observatory~(LHAASO) is one of the mostsensitive gamma-ray detector arrays currently operating at TeV and PeVenergies. Recently the LHAASO experiment detected ultra-high-energy~(UHE;$E_{\gamma}\gtrsim 100~\mathrm{TeV}$) photon emissions up to $1.4~\mathrm{PeV}$from twelve astrophysical gamma-ray sources. We point out that the detection ofcosmic photons at such energies can constrain the photon self-decay motivatedby superluminal Lorentz symmetry violation~(LV) to a higher level, thus can putstrong constraints to certain LV frameworks. Meanwhile, we suggest that thecurrent observation of the PeV-scale photon with LHAASO may provide hints topermit a subluminal type of Lorentz violation in the proximity of the Planckianregime, and may be compatible with the light speed variation at the scale of$3.6\times 10^{17}~\mathrm{GeV}$ recently suggested from gamma-ray burst~(GRB)time delays. We further propose detecting PeV photons coming from extragalacticsources with future experiments, based on LV-induced threshold anomalies of$e^{+}e^{-}$ pair-production, as a crucial test of subluminal Lorentzviolation. We comment that these observations are consistent with aD-brane/string-inspired quantum-gravity framework, the space-time foam model.

Ultrahigh-energy photons from LHAASO as probes of Lorentz symmetry violations