Primordial black holes in loop quantum cosmology: The effect on the threshold

Understand

Primordial black holes form in the early Universe and constitute one of the most viable candidates for dark matter.

• The study of their formation process requires the determination of a critical energy density perturbation threshold $\delta_\mathrm{c}$, which in general depends on the underlying gravity theory.
• Up to now, the majority of analytic and numerical techniques calculate $\delta_\mathrm{c}$ within the framework of general relativity.
• In this work, using simple physical arguments we estimate semi-analytically the PBH formation threshold within the framework of quantum gravity, working for concreteness within loop quantum cosmology (LQC).