Single field double inflation and primordial black holes

By K. Kannike, L. Marzola, M. Raidal, H. Veermae. 2017

273 citations recorded by the source corpus.

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 approximation fails. 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 find that these features generally require a potential with a local minimum. We show that the associated primordial black hole mass function is only approximately lognormal.

Subfields: Astronomy and Astrophysics, Oceanography

View Paper: https://www.semanticscholar.org/paper/b870c3896f397c972457cbbf246c878c4d92084a

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

1. Florian Kuhnel
2. B. Carr
3. A. Kehagias
4. V. Vaskonen
5. J. Silk
6. H. Veermae
7. M. Raidal
8. Gert Hütsi

In Oceanography

1. B. Carr
2. H. Di
3. Y. Gong
4. A. Kehagias
5. Florian Kuhnel
6. V. Vaskonen

Citations in the corpus

• Gravitational waves from primordial black hole mergers (2017, background): “[40] that wider mass functions usually develop an extended low mass tail when compared to the lognormal form.”
• Primordial Black Holes as Dark Matter: Recent Developments (2020, background): “[89] Kristjan Kannike, Luca Marzola, Martti Raidal, and Hardi Veermäe, “Single Field Double Inflation and Primordial Black Holes,” JCAP 1709, 020 (2017).”
• Primordial black holes as generators of cosmic structures (2018, background): “It has been demonstrated both numerically (Green 2016) and analytically (Kannike et al. 2017) for the case in which the slow-roll approximation holds.”
• Two populations of LIGO-Virgo black holes (2020, background): “[70, 71]) if the critical scaling relationship [72–74] is not accounted for in the gravitational collapse.”
• Primordial black holes and second order gravitational waves from ultra-slow-roll inflation (2017, background): “For typical potentials with a inflection point, the problem is that inflation either ends or the slow-roll condition is violated before reaching the near inflection point [23, 25, 37].”
• Primordial black holes as dark matter candidates (2021, background): “This form was first suggested by Dolgov & Silk [40] (see also References [41, 42]) and has been demonstrated both numerically [43] and analytically [44] for the case in which the slow-roll approximation holds.”