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• W3038659700 startingPage "20200364" @default.
• W3038659700 abstract "Slow-roll inflation may simultaneously solve the horizon problem and generate a near scale-free fluctuation spectrum P(k). These two processes are intimately connected via the initiation and duration of the inflationary phase. But a recent study based on the latest Planck release suggests that P(k) has a hard cutoff, k_min > 0, inconsistent with this conventional picture. Here we demonstrate quantitatively that most---perhaps all---slow-roll inflationary models fail to accommodate this minimum cutoff. We show that the small parameter `epsilon' must be > 0.9 throughout the inflationary period to comply with the data, seriously violating the slow-roll approximation. Models with such an epsilon predict extremely red spectral indices, at odds with the measured value. We also consider extensions to the basic picture (suggested by several earlier workers) by adding a kinetic-dominated or radiation-dominated phase preceding the slow-roll expansion. Our approach differs from previously published treatments principally because we require these modifications to---not only fit the measured fluctuation spectrum, but to simultaneously also---fix the horizon problem. We show, however, that even such measures preclude a joint resolution of the horizon problem and the missing correlations at large angles." @default.
• W3038659700 created "2020-07-10" @default.
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• W3038659700 date "2020-07-01" @default.
• W3038659700 modified "2023-09-24" @default.
• W3038659700 title "Viability of slow-roll inflation in light of the non-zero <i>k</i> _min measured in the cosmic microwave background power spectrum" @default.
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• W3038659700 doi "https://doi.org/10.1098/rspa.2020.0364" @default.
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