Aetherlike Lorentz-breaking actions

We show that CPT-even aetherlike Lorentz-breaking actions, for the scalar and electromagnetic fields, are generated via their appropriate Lorentz-breaking coupling to spinor fields, in three, four, and five space-time dimensions. Besides, we also show that aetherlike terms for the spinor field can be generated as a consequence of the same couplings. We discuss the dispersion relations in the theories with aetherlike Lorentz-breaking terms and find the tree-level effective (Breit) potential for fermion scattering and the one-loop effective potential corresponding to the action of the scalar field.

Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)[303461-2009/8]

Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)

Coordenacao de Aperfeicoamento do Pessoal do Nivel Superior (CAPES)[AUX-PE-PROCAD 579/2008]

CNPq/PRONEX/FAPESQ