GRBs and Lorentz Invariance Violation

Constraints on Lorentz invariance violation from the LHAASO observation of GRB 221009A

“…In order to fully exploit the information carried by the observation, we employ two distinct event by event methods, including the PV and ML methods. In terms of the results, our constraints on the superluminal scenario are comparable to those in [27], whereas the constraints on the subluminal scenario that we obtain are stronger than those in [27].…”

“…We note that a previous study [27] also utilized LHAASO data to establish constraints on the LIV energy scale. At the time of that study, only the data from WCDA had been published, and the data from KM2A were not available.…”

“…At the time of that study, only the data from WCDA had been published, and the data from KM2A were not available. The authors of [27] employed a method that involved fitting the light curve and spectrum and minimizing the χ 2 value to obtain the confidence interval of the LIV parameters. In contrast, we utilize data from both WCDA and KM2A in this study.…”

“…The Lorentz invariance violation (LIV) can alter the dispersion relation of photons in vacuum, and lead to numerous observable effects such as energy-dependent speed of JCAP04(2024)060 light [20][21][22][23][24][25][26][27][28], photon decay or split [29][30][31], pair-production threshold anomaly [32][33][34], and others. Notable advancements have been achieved in these areas in the past years [35].…”