Inflationary predictions for scalar and tensor fluctuations reconsidered.

@article{Boyle2006InflationaryPF,
  title={Inflationary predictions for scalar and tensor fluctuations reconsidered.},
  author={Latham A. Boyle and Paul J. Steinhardt and Neil Turok},
  journal={Physical review letters},
  year={2006},
  volume={96 11},
  pages={
          111301
        }
}
We reconsider the predictions of inflation for the spectral index of scalar (energy density) fluctuations (ns) and the tensor/scalar ratio (r) using a discrete, model-independent measure of the degree of fine-tuning required to obtain a given combination of (ns, r ). We find that, except for cases with numerous unnecessary degrees of fine-tuning, ns is less than 0.98, measurably different from exact Harrison-Zel'dovich. Furthermore, if ns >or= 0.95, in accord with current measurements, the… 

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