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Primordial black hole formation in $$f(R)=R+\alpha R^2$$ gravity: perturbative and non-perturbative analysis

Crossref DOI link: https://doi.org/10.1140/epjc/s10052-026-15876-w

Published Online: 2026-06-07

Update policy: https://doi.org/10.1007/springer_crossmark_policy

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