Primordial black holes from string inflation

By M. Cicoli, V. A. Diaz, F. Pedro. Journal of Cosmology and Astroparticle Physics, 2018

150 citations recorded by the source corpus.

We present a single-field string inflationary model which allows for the generation of primordial black holes in the low mass region where they can account for a significant fraction of the dark matter abundance. The potential is typical of type IIB fibre inflation models and features a plateau at CMB scales and a near inflection point at small distance scales where the power spectrum is enhanced due to a period of ultra slow-roll. The tunability of the underlying parameters may be guaranteed by scanning through the string landscape and their stability against quantum corrections is ensured by an effective shift symmetry.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/da5889878b7ab9e94b1dbe5b2b982fe43a336c84

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In Astronomy and Astrophysics

1. A. Kehagias
2. A. Riotto
3. G. Franciolini
4. G. Tringas
5. I. Dalianis
6. D. K. Hazra
7. M. Braglia
8. A. Starobinsky

In Nuclear and High Energy Physics

1. A. Kehagias
2. G. Tringas
3. I. Dalianis
4. A. Riotto
5. A. Starobinsky
6. F. Finelli
7. G. Smoot
8. L. Sriramkumar

Citations in the corpus

• Primordial black holes from α-attractors (2018, background): “Critical Higgs inflation [20], simple polynomials or potentials with a radiative plateau a la Coleman-Weinberg where the inflaton is non-minimally coupled to the Ricci scalar [21, 22], fibre inflation [24] and axion models [25] inspired by string theory, supergravity [26] are examples of single fiel”
• Primordial black holes from inflation and quantum diffusion (2018, methodology): “[18] with parameter set defined in Tab 1.”
• Generating PBHs and small-scale GWs in two-field models of inflation (2020, background): “This can be achieved in single-field inflation scenarios by using a local feature in the inflaton potential like a rapid change of its amplitude or a break in its first derivative [7–9], an inflection point [10–18] or a tiny bump superimposed on it [19, 20], non-trivial inflaton sound speed [21–23]1”
• Mechanisms for primordial black hole production in string theory (2018, unknown): “For example, an attempt towards embedding this model within string theory via fine-tuned string-loop corrections in fibre inflation has been made very recently in [12], although it has not yet proved possible to fine-tune a setup such that cosmological (1)A possible obstacle for PBH’s as Dark Matter”