How Many e-Folds Should We Expect from High-Scale Inflation?

@article{Remmen2014HowME,
  title={How Many e-Folds Should We Expect from High-Scale Inflation?},
  author={Grant N. Remmen and S. Carroll},
  journal={Physical Review D},
  year={2014},
  volume={90},
  pages={063517}
}
We address the issue of how many e-folds we would naturally expect if inflation occurred at an energy scale of order 10^(16) GeV. We use the canonical measure on trajectories in classical phase space, specialized to the case of flat universes with a single scalar field. While there is no exact analytic expression for the measure, we are able to derive conditions that determine its behavior. For a quadratic potential V(ϕ)=m^2ϕ^2/2 with m=2×10^(13) GeV and cutoff at M_(Pl)=2.4×10^(18) GeV, we… 

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