[SEMINARI] SEMINAR: Lars Nilse

[German Rodrigo Garcia]

Quantization and High Energy Unitarity in Orbifold Theories

Lars Nilse
University of Manchester
Thursday, 25 of May of 2006     12:00 PM
Theoretical Physics Seminars room

Abstract

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.