Abstract
Abstract
We study the power spectrum of the comoving curvature perturbation ℛ in the
model that glues two linear potentials of different slopes, originally proposed by Starobinsky.
We find that the enhanced power spectrum reaches its maximum at the wavenumber which is π
times the junction scale. The peak is ∼ 2.61 times larger than the ultraviolet plateau. We
also show that its near-peak behavior can be well approximated by a constant-roll model, once we
define the effective ultra-slow-roll e-folding number appropriately by considering the
contribution from non-single-clock phase only. Such an abrupt transition to non-attractor phase
can leave some interesting characteristic features in the energy spectrum of the scalar-induced
gravitational waves, which are detectable in the space-borne interferometers if the primordial
black holes generated at such a high peak are all the dark matter.
Subject
Astronomy and Astrophysics
Cited by
5 articles.
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