Surprising phenomena in a rich new class of inflationary models

Details Surprising phenomena in a rich new class of inflationary models Surprising phenomena in a rich new class of inflationary models

2009-11-18

arxiv.org/abs/0911.3397v2

JCAP 1004:031, 2010

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

12 pages, 5 figures, 1 table, references + comments added, errors corrected, conclusions unchanged, version published in JCAP

Scientific paper

10.1088/1475-7516/2010/04/031

We report on a new class of fast-roll inflationary models. In a huge part of its parameter space, inflationary perturbations exhibit quite unusual phenomena such as scalar and tensor modes freezing out at widely different times, as well as scalar modes reentering the horizon during inflation. In another, narrower range of parameters, this class of models agrees with observations. One specific point in parameter space is characterized by extraordinary behavior of the scalar perturbations. Freeze-out of scalar perturbations as well as particle production at horizon crossing are absent. Also the behavior of the perturbations around this quasi-de Sitter background is dual to a quantum field theory in flat space-time. Finally, the form of the primordial power spectrum is determined by the interaction between different modes of scalar perturbations.

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