Singular and non-singular endstates in massless scalar field collapse
  We study the collapse of a massless scalar field coupled to gravity. A class of blackhole solutions are identified. We also report on a class of solutions where collapse starts from a regular spacelike surface but then the collapsing scalar field freezes. As a result, in these solutions, a black hole does not form, neither is there any singularity in the future. 
Swastik Bhattacharya
gr-qc astro-ph.HE