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• W2959363404 abstract "We consider the steepest rate at which the power spectrum from single field inflation can grow, with the aim of providing a simple explanation for the ${k}^{4}$ growth found recently. With this explanation in hand we show that a slightly steeper ${k}^{5}(mathrm{log}text{ }k{)}^{2}$ growth is, in fact, possible. Moreover, we argue that the power spectrum after a steep growth cannot immediately decay, but must remain large for the $k$ modes that exit during a $ensuremath{sim}2$ $e$-fold period. We also briefly consider how a strong growth can affect the spectral index of longer wavelengths preceding the growth and show that even the conversion of isocurvature modes likely cannot lead to a stronger growth. These results have implications for the formation of primordial black holes and other phenomena that require a large amplitude of power spectrum at short scales." @default.
• W2959363404 created "2019-07-23" @default.
• W2959363404 creator A5017421417 @default.
• W2959363404 creator A5071167023 @default.
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• W2959363404 date "2019-11-26" @default.
• W2959363404 modified "2023-10-16" @default.
• W2959363404 title "Dissecting the growth of the power spectrum for primordial black holes" @default.
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• W2959363404 doi "https://doi.org/10.1103/physrevd.100.103529" @default.
• W2959363404 hasPublicationYear "2019" @default.
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