1.
Phys Rev Lett
; 87(25): 251304, 2001 Dec 17.
Artigo
em Inglês
| MEDLINE
| ID: mdl-11736558
RESUMO
Infrared, optical, and ultraviolet spectropolarimetry of cosmological sources is used to constrain the pure electromagnetic sector of a general Lorentz-violating standard-model extension. The coefficients for Lorentz violation are bounded to less than 3 x 10(-32).
2.
Phys Rev Lett
; 87(14): 141601, 2001 Oct 01.
Artigo
em Inglês
| MEDLINE
| ID: mdl-11580640
RESUMO
The role of Lorentz symmetry in noncommutative field theory is considered. Any realistic noncommutative theory is found to be physically equivalent to a subset of a general Lorentz-violating standard-model extension involving ordinary fields. Some theoretical consequences are discussed. Existing experiments bound the scale of the noncommutativity parameter to (10 TeV)(-2).