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We study in detail the moduli space of solutions discovered in LLM relaxingthe constraint that guarantees the absence of singularities. The solutions fallinto three classes, non-singular, null-singular and time machines with atime-like naked singularity. We study the general features of these metrics andprove that there are actually just two generic classes of space-times - thosewith null singularities are in the same class as the non-singular metrics.AdS/CFT seems to provide a dual description only for the first of these twotypes of space-time in terms of a unitary CFT indicating the possible existenceof a chronology protection mechanism for this class of geometries.Comment: 34 pages, 7 figures, LaTeX. References adde

Singularities and closed time-like curves in type-IIB 1/2 BPS geometries