Primordial black hole driven cosmic acceleration
arXiv:2511.18080 · doi:10.1142/S0218271825440158
Abstract
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 can trigger exponential inflation with graceful exit and reheating. Additionally, PBHs with and abundances near matter-radiation equality can act as an early dark energy component, offering a potential resolution to the Hubble tension.
Received Honorable Mention from the Gravity Research Foundation in the 2025 Essay Competition
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