HAWC's new energy estimator yields a Crab spectrum beyond 100 TeV and 95% confidence lower limits on the cutoff energy above 200 TeV for the hardest Galactic source.
Constraints on Lorentz invariance violation using HAWC observations above 100 TeV
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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 $\rm E_{LIV}^{(1)}$.
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The Spectrum of the Crab Nebula and Highest Energy Photons Measured by HAWC
HAWC's new energy estimator yields a Crab spectrum beyond 100 TeV and 95% confidence lower limits on the cutoff energy above 200 TeV for the hardest Galactic source.