TY  - JOUR
AU  - Motohashi, H.
AU  - Hu, W.
PY  - 2017
DA  - 2017//
TI  - Primordial black holes and slow-roll violation
T2  - Phys. Rev. D
JO  - Physical Review D
SP  - 063503
EP  - 9pp
VL  - 96
IS  - 6
PB  - Amer Physical Soc
AB  - For primordial black holes (PBH) to be the dark matter in single-field inflation, the slow-roll approximation must be violated by at least O(1) in order to enhance the curvature power spectrum within the required number of e-folds between cosmic microwave background scales and PBH mass scales. Power spectrum predictions which rely on the inflaton remaining on the slow-roll attractor can fail dramatically leading to qualitatively incorrect conclusions in models like an inflection potential and misestimate the mass scale in a running mass model. We show that an optimized temporal evaluation of the Hubble slow-roll parameters to second order remains a good description for a wide range of PBH formation models where up to a 10(7) amplification of power occurs in 10 e-folds or more.
SN  - 2470-0010
UR  - http://arxiv.org/abs/1706.06784
UR  - https://doi.org/10.1103/PhysRevD.96.063503
DO  - 10.1103/PhysRevD.96.063503
LA  - English
N1  - WOS:000409436800005
ID  - Motohashi+Hu2017
ER  -