Black hole formation and slow-roll inflation

Details Black hole formation and slow-roll inflation Black hole formation and slow-roll inflation

2007-11-30

arxiv.org/abs/0711.5006v2

JCAP0804:038,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, 6 figures, version to apper in JCAP

Scientific paper

10.1088/1475-7516/2008/04/038

Black hole formation may occur if the spectrum of the curvature perturbation \zeta increases strongly as the scale decreases. As no such increase is observed on cosmological scales, black hole formation requires strongly positive running n' of the spectral index n, though the running might only kick in below the `cosmological scales' probed by the CMB anisotropy and galaxy surveys. A concrete and well-motivated way of producing this running is through the running mass model of slow roll inflation. We obtain a new observational bound n' < 0.026 on the running provided by this model, improving an earlier result by a factor two. We also discuss black hole production in more general scenarios. We show that the usual conditions \epsilon << 1 and |\eta| << 1 are enough to derive the spectrum {\cal P}_{\zeta}(k), the introduction of higher order parameters \xi^{2} etc. being optional.

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