Discrete symmetries and localization in a brane-world - art. no. 025020

Discrete symmetries are studied in warped space-times with one extra dimens ion. In particular, we analyze the compatibility of five- and four-dimensio nal charge conjugation, parity, time reversal, and the orbifold symmetry Z( 2) With localization of fermions on the four-dimensional brane-world and Lo rentz invariance. We then show that, when a suitable topological scalar fie ld (the "kink") is included, fermion localization is a consequence of (five -dimensional) CPT invariance.