Constraints on Lorentz invariance violation using HAWC observations above 100 TeV

Abstract

Due to the high energies and long distances involved, astrophysical observations provide a unique opportunity to test possible signatures of Lorentz Invariance Violation (LIV). Superluminal LIV enables the decay of photons at high energy over relatively short distances, giving astrophysical spectra which have a hard cutoff above this energy. The High Altitude Water Cherenkov (HAWC) observatory is the most sensitive currently-operating gamma-ray observatory in the world above 10 TeV. Together with the recent development of an energy-reconstruction algorithm for HAWC using an artificial neural network, HAWC can make detailed measurements of gamma-ray energies above 100 TeV. With these observations, HAWC can limit the LIV energy scale greater than $10^{31}$ eV, over 800 times the Planck energy scale. This limit on LIV is over 60 times more constraining than the best previous value for ${\mathrm{E}}_{\mathrm{LIV}}^{(1)}$.

arXiv commentPresented at the 36th International Cosmic Ray Conference (ICRC 2019)

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Cited by in corpus (1)

• Constraints on Lorentz invariance violation from HAWC observations of gamma rays above 100 TeV