A note on the cylindrical collapse of counter-rotating dust
  We find analytical solutions describing the collapse of an infinitely long cylindrical shell of counter-rotating dust. We show that--for the classes of solutions discussed herein--from regular initial data a curvature singularity inevitably develops, and no apparent horizons form, thus in accord with the spirit of the hoop conjecture. 
Sergio M. C. V. Goncalves (Yale), Sanjay Jhingan (YITP, Japan)