par Rahman, Mohammad Rakibur 
Référence Physical review. D, Particles, fields, gravitation, and cosmology, 87, 6, 065030
Publication Publié, 2013-03
Référence Physical review. D, Particles, fields, gravitation, and cosmology, 87, 6, 065030
Publication Publié, 2013-03
Article révisé par les pairs
| Résumé : | We consider the electromagnetic and gravitational interactions of a massive Rarita-Schwinger field. Stückelberg analysis of the system, when coupled to electromagnetism in flat space or to gravity, reveals in either case that the effective field theory has a model-independent upper bound on its UV cutoff, which is finite but parametrically larger than the particle's mass. It is the helicity-1/2 mode that becomes strongly coupled at the cutoff scale. If the interactions are inconsistent, the same mode becomes a telltale sign of pathologies. Alternatively, consistent interactions are those that propagate this mode within the light cone. Studying its dynamics not only sheds light on the Velo-Zwanziger acausality, but also elucidates why supergravity and other known consistent models are pathology-free. © 2013 American Physical Society. |
