  A brane universe derived from the Randall-Sundrum models is considered in
which an additional Misner-like periodicity is introduced in the extra
direction. This model solves the ambiguity in the choice of the brane world by
identifying the branes with opposite tensions, in such a way that if one enters
the brane with positive tension, one finds oneself emerging from the brane with
negative tension, without having experienced any tension. We show that the
cosmological evolution resulting from this model matches that of the standard
Friedmann scenario, at least in the radiation dominated era, and that there
exist closed timelike curves only in the bulk, but not in the branes which are
chronologically protected from causality violations by quantum-mechanically
stable chronology horizons.
