A smooth bouncing cosmology with scale invariant spectrum

Details A smooth bouncing cosmology with scale invariant spectrum A smooth bouncing cosmology with scale invariant spectrum

2007-02-20

arxiv.org/abs/hep-th/0702165v2

JCAP 0711:010,2007

Physics

High Energy Physics

High Energy Physics - Theory

20 pages, 1 fig. v2: references added, JCAP published version

Scientific paper

10.1088/1475-7516/2007/11/010

We present a bouncing cosmology which evolves from the contracting to the expanding phase in a smooth way, without developing instabilities or pathologies and remaining in the regime of validity of 4d effective field theory. A nearly scale invariant spectrum of perturbations is generated during the contracting phase by an isocurvature scalar with a negative exponential potential and then converted to adiabatic. The model predicts a slightly blue spectrum, n_S >~ 1, no observable gravitational waves and a high (but model dependent) level of non-Gaussianities with local shape. The model represents an explicit and predictive alternative to inflation, although, at present, it is clearly less compelling.

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