Quantization and High Energy Unitarity in Orbifold Theories

por Lars Nilse (University of Manchester)

jueves 25 may. 2006 12:00 → 13:00 Europe/Madrid

Sala Seminarios (Dpto. de Física Teórica (UVEG))

Extra-dimensional quantum field theories compactified on orbifolds naturally i nclude local brane kinetic terms at the orbifold fixed points. - We study the particular example of 5D Yang-Mills theories compactified on an S1/Z_2 orbifold. We describe the consistent quantization of these theories before the Kaluza Klein reduction. Based on the underlying Ward and Slavnov Taylor identities, we present an all-order proof of a generalized equivalence theorem. The theorem relates scattering amplitudes of longitudinal Kaluza-Klein gauge bosons to amplitudes of the corresponding scalar modes and ensures the high energy unitarity of these theories. We point out that our results are not specific to compactifications on S1/Z_2, but hold for any of the 19 possible 1D or 2D orbifolds.