Journal
PHYSICAL REVIEW LETTERS
Volume 124, Issue 13, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.124.131101
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Funding
- U.S. National Science Foundation (NSF)
- U.S. Department of Energy Office of High-Energy Physics
- Laboratory Directed Research and Development (LDRD) program of Los Alamos National Laboratory
- Consejo Nacional de Ciencia y Tecnologia (CONACyT), Mexico [271051, 232656, 260378, 179588, 254964, 258865, 243290, 132197, A1S-46288, A1-S-22784, 873, 1563, 341, 323]
- DGAPA-UNAM [AG100317, IN111315, IN111716-3, IN111419, IA102019, IN112218]
- VIEPBUAP
- PIFI, PROFOCIE
- FAPESP [2015/15897-1, 2017/03680-3]
- LNCC/MCTI, Brazil
- University of Wisconsin Alumni Research Foundation
- Institute of Geophysics, Planetary Physics, and Signatures at Los Alamos National Laboratory
- Polish Science Centre [DEC-2018/31/B/ST9/01069, DEC-2017/27/B/ST9/02272]
- Coordinacion de la Investigacion Cientifica de la Universidad Michoacana
- Royal Society-Newton Advanced Fellowship [180385]
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Because of the high energies and long distances to the sources, 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. The high altitude water Cherenkov (HAWC) observatory is among the most sensitive gamma-ray instruments currently operating above 10 TeV. HAWC finds evidence of 100 TeV photon emission from at least four astrophysical sources. These observations exclude, for the strongest of the limits set, the LIV energy scale to 2.2 x 10(31) eV, over 1800 times the Planck energy and an improvement of 1 to 2 orders of magnitude over previous limits.
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