Formalizing the slow-roll approximation in inflation.

@article{Liddle1994FormalizingTS,
  title={Formalizing the slow-roll approximation in inflation.},
  author={Liddle and Parsons and Barrow},
  journal={Physical review. D, Particles and fields},
  year={1994},
  volume={50 12},
  pages={
          7222-7232
        }
}
The meaning of the inflationary slow-roll approximation is formalised. Comparisons are made between an approach based on the Hamilton-Jacobi equations, governing the evolution of the Hubble parameter, and the usual scenario based on the evolution of the potential energy density. The vital role of the inflationary attractor solution is emphasised, and some of its properties described. We propose a new measure of inflation, based upon contraction of the comoving Hubble length as opposed to the… 
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