Lorentz Boosts as Squeeze Transformations and Coherence Problems
  The quark model and the parton model are known to be two different manifestations of the same covariant entity. However, the interaction amplitudes of partons are incoherent while they are coherent in the quark model. According to Feynman, this is due to the dilation of the interaction time among the quarks. We present a quantitative analysis of this time-dilation problem using Lorentz boosts as squeeze transformations. 
D. Han and Y. S. Kim