Journal
MODERN PHYSICS LETTERS A
Volume 22, Issue 25-28, Pages 1911-1920Publisher
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S0217732307025133
Keywords
inflation; density fluctuation; primordial black holes
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We present an inflation model which realizes density fluctuations with a negative running spectral index large enough as inferred by WMAP observation. In this model two different stages of inflation occur successively in the observable regime. As a result of numerical investigation, we find that the fluctuations generated in the late first inflationary stage are enhanced to the level significant amount of primordial black holes could be produced due to parametric resonance and that it is stretched to a cosmological scale in the second inflation.
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