Realistic collapse model of bosonic strings
  In this paper we will utilize the non-trivial shapes of the strings in order to come up with realistic definition of probability amplitudes in a lot more natural way than could be done in point particle counterpart. We then go on to "translate" GRW model to string theory context. In this paper we limit ourselves to boson-only toy model without D-branes. 
Roman Sverdlov
physics.gen-ph hep-th