Journal
PHYSICS LETTERS B
Volume 775, Issue -, Pages 262-265Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2017.10.066
Keywords
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Funding
- Lancaster-Manchester-Sheffield Consortium for Fundamental Physics under STFC grant [ST/L000520/1]
- STFC [ST/J000418/1, ST/L000520/1, ST/P000800/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/L000520/1, ST/P000800/1, ST/J000418/1] Funding Source: researchfish
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Ultra-slow-roll (USR) inflation is a new mode of inflation which corresponds to the occasions when the inflaton field must traverse an extremely flat part of the scalar potential, when the usual slow-roll (SR) fails. We investigate USR and obtain an estimate for how long it lasts, given the initial kinetic density of the inflaton. We also find that, if the initial kinetic density is small enough, USR can be avoided and the usual SR treatment is valid. This has important implications for inflection-point inflation. (C) 2017 The Author(s). Published by Elsevier B.V.
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