Closed timelike curves and holography in compact plane waves

摘要: We discuss plane wave backgrounds of string theory and their relation to G?del-like universes. This involves a twisted compactification along the direction propagation wave, which induces closed timelike curves. show, however, that no such curves are geodesic. The particle geodesics preferred holographic screens we find qualitatively different from those in Of two types screen, only one is suited dimensional reduction and/or T-duality, this provides ``holographic protection'' chronology. other type relevant an observer localized all directions, constructed both for compact non-compact waves, result possible independent interest. comment on consistency field spaces, there (and null) but (or geodesics.