Power Spectrum of the Density Perturbations From Smooth Hybrid New Inflation Model

Details Power Spectrum of the Density Perturbations From Smooth Hybrid New Inflation Model Power Spectrum of the Density Perturbations From Smooth Hybrid New Inflation Model

2006-05-25

arxiv.org/abs/hep-ph/0605271v3

Phys.Rev.D74:043525,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

23 pages, 8 figures : minor corrections

Scientific paper

10.1103/PhysRevD.74.043525

We numerically investigate density perturbations generated in the smooth hybrid new inflation model, a kind of double inflation model that is designed to reproduce the running spectral index suggested by the WMAP results. We confirm that this model provides the running spectral index within 1sigma range of the three year WMAP result. In addition, we find a sharp and strong peak on the spectrum of primordial curvature perturbation at small scales. This originates from amplification of fluctuation in the first inflaton fields due to parametric resonance, which takes place in the oscillatory phase between two inflationary regime. Formation probability of primordial black holes (PBHs) is discussed as a consequence of such peak.

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