| Texto completo | |
| Autor(es): |
Fresneda, R.
;
Gitman, D. M.
;
Shabad, A. E.
Número total de Autores: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | PHYSICAL REVIEW D; v. 91, n. 8, p. 10-pg., 2015-04-03. |
| Resumo | |
We find dispersion laws for the photon propagating in the presence of mutually orthogonal constant external electric and magnetic fields in the context of the theta-expanded noncommutative QED. We show that there is no birefringence to the first order in the noncommutativity parameter theta. By analyzing the group velocities of the photon eigenmodes we show that there occurs superluminal propagation for any direction. This phenomenon depends on the mutual orientation of the external electromagnetic fields and the noncommutativity vector. We argue that the propagation of signals with superluminal group velocity violates causality in spite of the fact that the noncommutative theory is not Lorentz invariant and speculate about possible workarounds. (AU) | |
| Processo FAPESP: | 14/08970-1 - Efeitos não lineares em problemas básicos da eletrodinâmica quântica |
| Beneficiário: | Dmitri Maximovitch Guitman |
| Modalidade de apoio: | Auxílio à Pesquisa - Pesquisador Visitante - Internacional |