Formation of Trapped Surfaces from Past Null Infinity
  In this paper, we extend the results of Klainerman and Rodnianski in \cite{KR:Trapped}, which were obtained for a finite region, by showing similar results from past null infinity. This allows us to recover and extend the results from past null infinity in the work of Christodoulou \cite{Chr:book}. 
Xinliang An
gr-qc math-ph math.AP math.DG math.MP