2025/11/22 by Dialektopoulos, Konstantinos, Papanikolaou, Theodoros, Zarikas, Vasilios
#FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc)
paper · doi:10.48550/arxiv.2511.18080
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 m < 5 × 108 \rm g can trigger exponential inflation with graceful exit and reheating. Additionally, PBHs with m ∼ 1012 \rm g and abundances 0.107 < Ω\rm PBH\rm eq < 0.5 near matter-radiation equality can act as an early dark energy component, offering a potential resolution to the Hubble tension.