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In 2002, Isenberg-Mazzeo-Pollack (IMP) constructed a series of vacuum initialdata sets via a gluing construction. In this paper, we investigate some localgeometry of these initial data sets as well as implications regarding theirspacetime developments. In particular, we state conditions for the existence ofouter trapped surfaces near the center of the IMP gluing neck and thence use ageneralization of the Penrose incompleteness theorem to deduce nullincompleteness of the resulting spacetimes.

Causal geodesic incompleteness of spacetimes arising from IMP gluing