Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 3, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2020/03/002
Keywords
inflation; primordial black holes
Funding
- Japan Society for the Promotion of Science (JSPS) [JP17H06359, JP18K13565, JP17H02890]
- World Premier International Research Center Initiative (WPI), MEXT, Japan
- Japanese Government (MEXT) Scholarship for Research Students
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The constant-roll inflation with small positive value of the constant-roll parameter beta equivalent to (sic)/H(phi) over dot = const: has been known to produce a slightly red-tilted curvature power spectrum compatible with the current observational constraints. In this work, we shed light on the constant-roll inflation with negative beta and investigate how a stage of constant-roll inflation may realize the growth in the primordial curvature power spectrum necessary to produce a peaked spectrum of primordial black hole abundance. We first review the behavior of constant-roll models in the range of parameters -3/2 < beta < 0, which allows for a constant-roll attractor stage generating a blue-tilted curvature power spectrum without superhorizon growth. As a concrete realization, we consider a potential with two slow-roll stages, separated by the constant-roll stage, in a way that satisfies the current constraints on the power spectrum and the primordial black hole abundance. The model can produce primordial black holes as all dark matter, LIGO-Virgo events, or OGLE microlensing events. Due to the range of different scalar tilts allowed by the constant-roll potential, this construction is particularly robust and testable by future observations.
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