Localization and anomalies on orbifolds

In this talk we discus some properties of supersymmetric theories on orbifolds in five dimensions. The structure of FI–tadpoles may lead to (strong) localization of charged bulk scalars. Orbifold theories may suffer from various kinds of anomalies. The parity anomaly may render the construction of the orbifold theory ill–defined. The gauge anomaly on the orbifold are localized at the fixed points, which can sometimes be canceled by a Chern–Simons term.