http://arxiv.org/abs/2006.03768
We propose a new single field inflation model in which the usual slow-roll inflation is joined to a new period of slow-climb and slow-roll inflation through a short intermediate non-inflationary phase. We then show that primordial curvature perturbations can be enhanced at small scales, a sizable amount of primordial black holes (PBHs) can be produced which make up most of dark matter, and the gravitational waves (GWs) induced by scalar metric perturbations that accompany with the formation of PBHs can be detectable by future GW experiments. Remarkably, the GW spectrum displays a unique oscillating character in the ultraviolet regions which originates from the short non-inflationary phase. A detection of such oscillations in the GW spectrum may suggest the existence of such a non-inflationary phase in the whole inflation, thus providing us a chance to reveal an interesting period in the evolution of the early universe and distinguish our model from others.
C. Fu, P. Wu and H. Yu
Tue, 9 Jun 20
72/94
Comments: 14 pages, 6 figures
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