Geodesic
Search for parity violation in cosmic rays
Teoretičeskaâ i matematičeskaâ fizika, Tome 184 (2015) no. 3, pp. 392-397

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We study a possible parity-violating area near the high-energy sources of photons. Such a violation might occur as a result of the condensation of a pseudoscalar background. We show that if this condensate has a large density gradient, then photons with a positive chirality decay into $e^+e^-$ pairs. This process consequently reduces the number of positively polarized photons and can increase the portion of positrons in cosmic rays.
Keywords: cosmic ray, Maxwell–Chern–Simons electrodynamics, photon decay. 
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     author = {A. A. Andrianov and D. Espriu and S. S. Kolevatov},
     title = {Search for parity violation in cosmic rays},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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     year = {2015},
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     url = {http://geodesic.mathdoc.fr/item/TMF_2015_184_3_a3/}
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A. A. Andrianov; D. Espriu; S. S. Kolevatov. Search for parity violation in cosmic rays. Teoretičeskaâ i matematičeskaâ fizika, Tome 184 (2015) no. 3, pp. 392-397. http://geodesic.mathdoc.fr/item/TMF_2015_184_3_a3/