2 research outputs found
Anomalies, Fayet-Iliopoulos terms and the consistency of orbifold field theories
We study the consistency of orbifold field theories and clarify to what
extent the condition of having an anomaly-free spectrum of zero-modes is
sufficient to guarantee it. Preservation of gauge invariance at the quantum
level is possible, although at the price, in general, of introducing operators
that break the 5d local parity. These operators are, however, perfectly
consistent with the orbifold projection. We also clarify the relation between
localized Fayet-Iliopoulos (FI) terms and anomalies. These terms can be
consistently added, breaking neither local supersymmetry nor the gauge
symmetry. In the framework of supergravity the localized FI term arises as the
boundary completion of a bulk interaction term: given the bulk Lagrangian the
FI is fixed by gauge invariance.Comment: 31 pages, 1 figure. v2: some typos corrected, references adde
Low Energy 6-Dimensional N=2 Supersymmertric SU(6) Models on Orbifolds
We propose low energy 6-dimensional N=2 supersymmetric SU(6) models on
and , where the orbifold
model can be embedded on the boundary 4-brane. For the
zero modes, the 6-dimensional N=2 supersymmetry and the SU(6) gauge symmetry
are broken down to the 4-dimensional N=1 supersymmetry and the gauge symmetry by orbifold projections. In
order to cancel the anomalies involving at least one , we add extra
exotic particles. We also study the anomaly free conditions and present some
anomaly free models. The gauge coupling unification can be achieved at TeV if the compactification scale for the fifth dimension is
TeV. The proton decay problem can be avoided by putting the quarks and
leptons/neutrinos on different 3-branes. And we discuss how to break the
gauge symmetry, solve the
problem, and generate the mass hierarchy naturally by using the
geometry. The masses of exotic particles can be at the order of 1 TeV after the
gauge symmetry breaking. We also forbid the dimension-5 operators for the
neutrino masses by gauge symmetry, and the realistic left-handed
neutrino masses can be obtained via non-renormalizable terms.Comment: Latex, 33 pages, discussion and references adde