Quantum fields and "Big Rip" expansion singularities
  The effects of quantized conformally invariant massless fields on the evolution of cosmological models containing a ``Big Rip'' future expansion singularity are examined. Quantized scalar, spinor, and vector fields are found to strengthen the accelerating expansion of such models as they approach the expansion singularity. 
Hector Calderon and William A. Hiscock (Montana State University)