Lorentz invariance violation induced threshold anomaly versus very-high energy cosmic photon emission from GRB 221009A

It has been reported that the Large High Altitude Air Shower Observatory (LHAASO) observed very high energy photons from GRB 221009A, with the highest energy reaching 18 TeV. We find that observation of such high energy photons is quite nontrivial since extragalactic background light could absorb these photons severely and the flux is too weak to be observed. Therefore we discuss a potential mechanism for us to observe these photons, and suggest that Lorentz invariance violation induced threshold anomaly of the process yy -> e-e+ provides a candidate to explain this phenomenon.

Automated summary

It has been reported that the Large High Altitude Air Shower Observatory (LHAASO) has observed extremely high-energy photons from GRB 221009A, with the maximum energy reaching 18 TeV. This observation is challenging due to the absorption of these photons by extragalactic background light and the weak flux. Therefore, a potential explanation for this phenomenon is proposed based on Lorentz invariance violation induced threshold anomaly in the process yy -> e-e+.