Quantum particle production near the big rip revisited
  The effect of quantum particle production near the big rip singularity has
been investigated previously, with the conclusion that the energy of the
produced particle decreases as the future singularity is approached. Hence, the
effect of particle production would not be effective to avoid the big rip
singularity. That calculation was performed by introducing an ultra-violet
cut-off. In the present work we consider a renormalization of the
energy-momentum tensor, obtainning a different expression for the particle
production. The new expression seems to indicate that the effect of particle
production may be dominant as the singularity is approached.
