Author:
Gorji Mohammad Ali,Motohashi Hayato,Mukohyama Shinji
Abstract
Abstract
We investigate a novel single field inflationary scenario which allows
a transition between a slow-roll k-inflation with c
s of order unity
and a ghost inflation with c
s ≃ 0, where c
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
s ≃ 0
regime. The model achieves the whole range of 0 ≤ c
s ≤ 1
avoiding strong coupling and gradient instability, and allows us to
access the c
s ≃ 0 regime in a self-consistent manner. We also
discuss implications to the formation of primordial black holes.
Subject
Astronomy and Astrophysics
Cited by
14 articles.
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