Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-03-08
PoS Texas2010:216,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
7 pages; parallel-session talk at 25th Texas Symposium on Relativistic Astrophysics, December 2010, Heidelberg, Germany
Scientific paper
Present and future ultra-high-energy-cosmic-ray facilities (e.g., the Pierre Auger Observatory with South and North components) and TeV-gamma-ray telescope arrays (e.g., HESS or VERITAS and CTA) have the potential to set stringent indirect bounds on the nine Lorentz-violating parameters of nonbirefringent modified Maxwell theory minimally coupled to standard Dirac theory. Theoretically, the most interesting case is isotropic Lorentz violation, which is described by a single parameter [taken to vanish for the standard Lorentz-invariant theory]. It appears possible to obtain in the future an upper (lower) indirect bound on this single isotropic Lorentz-violating parameter at the +10^{-21} (-10^{-17}) level. Comparison is made with existing and future direct bounds from laboratory experiments. The possible physics implications of upper bounds at the 10^{-21} level are discussed.
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