Generalised hyperbolicity in spacetimes with string-like singularities
  In this paper we present well-posedness results of the wave equation in $H^{1}$ for spacetimes that contain string-like singularities. These results extend a framework able to characterise gravitational singularities as obstruction to the dynamics of test fields rather than point particles. In particular, we discuss spacetimes with cosmic strings and the relation of our results to the Strong Cosmic Censorship Conjecture. 
Yafet Sanchez Sanchez and James A. Vickers
gr-qc math.AP