Primordial black hole-driven cosmic acceleration

In this paper, we propose a natural mechanism for cosmic acceleration driven by Primordial Black Holes (PBHs) with repulsive behavior, within a Swiss Cheese cosmological framework. Considering regular black hole spacetimes such as Hayward, Bardeen and Dymnikova as well as the singular Schwarzschild-de Sitter case we consistently find a robust PBH-driven cosmic acceleration phase. This phase ends either at an energy scale set by the PBH parameters or through black hole evaporation. Notably, one finds that ultra-light PBHs with [Formula: see text][Formula: see text]g can trigger exponential inflation with graceful exit and reheating. Additionally, PBHs with [Formula: see text][Formula: see text]g and abundances [Formula: see text] near matter-radiation equality can act as an early dark energy component, offering a potential resolution to the Hubble tension.