Spectral density

Quantum mechanics

Cosmic background radiation

String (physics)

Theoretical physics

Anisotropy

Primordial black hole

Inflation (cosmology)

Statistics

Inflection point

Astrophysics

Binary black hole

Physics

Mathematics

Gravitational wave

Geometry

Cosmic microwave background

Symmetry (geometry)

Dark matter

String theory

Journal of Cosmology and Astroparticle Physics

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 large distance scales where the power spectrum is enhanced due to a period of ultra slow-roll. The tunability of the underlying parameters is guaranteed by scanning through the string landscape and their stability against quantum corrections is ensured by an effective shift symmetry.

Primordial black holes from string inflation