Trans-Planckian problem of inflationary cosmology

@article{Martin2001TransPlanckianPO,
  title={Trans-Planckian problem of inflationary cosmology},
  author={J{\'e}r{\^o}me Martin and Robert Brandenberger},
  journal={Physical Review D},
  year={2001},
  volume={63},
  pages={123501-123517}
}
In most current models of inflation based on a weakly self-coupled scalar matter field minimally coupled to gravity, the period of inflation lasts so long that, at the beginning of the inflationary period, the physical wavelengths of comoving scales which correspond to the present large-scale structure of the Universe were smaller than the Planck length. Thus, the usual computations of the spectrum of fluctuations in these models involve extrapolating low-energy physics (both in the matter and… 

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