Single Field Double Inflation and Primordial Black Holes [CEA]

http://arxiv.org/abs/1705.06225


Within the framework of scalar-tensor theories, we study the conditions that allow single field inflation dynamics on small cosmological scales to significantly differ from that of the large scales probed by the observations of cosmic microwave background. The resulting single field double inflation scenario is characterised by two consequent inflation eras, usually separated by a period where the slow-roll condition is violated. At large field values the dynamics of the inflaton is dominated by the interplay between its non-minimal coupling to gravity and the radiative corrections to the inflaton self-coupling. For small field values the potential is, instead, dominated by a polynomial that results in a hilltop inflation. Without relying on the slow-roll approximation, which is invalidated by the appearance of the intermediate stage, we propose a concrete model that matches the current measurements of inflationary observables and employs the freedom granted by the framework on small cosmological scales to give rise to a sizeable population of primordial black holes generated by large curvature fluctuations. We show that the associated primordial black hole mass function is approximately lognormal.

Read this paper on arXiv…

K. Kannike, L. Marzola, M. Raidal, et. al.
Thu, 18 May 17
13/60

Comments: 14 pages, 2 figures