Spectrum of Cosmological Perturbations from Multiple-Stage Inflation

Details Spectrum of Cosmological Perturbations from Multiple-Stage Inflation Spectrum of Cosmological Perturbations from Multiple-Stage Inflation

1998-06-24

arxiv.org/abs/hep-ph/9806461v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

LaTeX file (24 pages), 4 figures and a style file. Revised version. Submitted to Physical Review D

Scientific paper

Within the context of supersymmetric hybrid inflation, we study a multiple-stage inflationary scenario that can generate a primordial spectrum of adiabatic density perturbations with a break at $k_b \simeq 0.05 h Mpc^{-1}$. The presence of such a break is supported by the APM galaxy survey data. We consider a specific model within this scenario and confront it with observational data. We reproduce the angular power spectrum of CMB anisotropies, and also account for the break in the power spectrum of galaxy clustering. In addition, we find a value for $\sigma_8$ in agreement with the one deduced from observations. A characteristic property of the spectrum is a drop of the spectral index from $n \simeq 1$ to $n \sim 0.6$ at $k \sim k_b$.

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