Exchange of signals around the event horizon in Schwarzschild space-time
  Red shift in communication and possibility of interaction is discussed for objects around the event horizon of Schwarzschild space-time. It is pointed out that the arrow of time within the horizon cannot always be inferred by observations carried out outside. Two scenarios are presented for the causal structure of the space-time and it is found that in one of them extended objects fall apart into their elementary constituents by crossing the horizon. 
M. Gawe{\l}czyk, J. Polonyi, A. Radosz, A. Siwek
gr-qc