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- W4212796539 endingPage "030" @default.
- W4212796539 startingPage "030" @default.
- W4212796539 abstract "We investigate a novel single field inflationary scenario which allows a transition between a slow-roll k-inflation with $c_{rm s}$ of order unity and a ghost inflation with $ c_{rm s} simeq 0$, where $ c_{rm s}$ is the sound speed for the curvature perturbations. We unify the two phases smoothly by appropriately taking into account a higher derivative scordatura term, which is always there from the effective field theory point of view but which becomes important only in the $c_{rm s} simeq 0$ regime. The model achieves the whole range of $0 leq c_{rm s} leq 1$ avoiding strong coupling and gradient instability, and allows us to access the $c_{rm s} simeq 0$ regime in a self-consistent manner. We also discuss implications to the formation of primordial black holes." @default.
- W4212796539 created "2022-02-24" @default.
- W4212796539 creator A5047518661 @default.
- W4212796539 creator A5087197974 @default.
- W4212796539 creator A5089226224 @default.
- W4212796539 date "2022-02-01" @default.
- W4212796539 modified "2023-09-30" @default.
- W4212796539 title "Inflation with 0 ≤ c <sub>s</sub> ≤ 1" @default.
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- W4212796539 doi "https://doi.org/10.1088/1475-7516/2022/02/030" @default.
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