The paper claims a positive R² curvature term accelerates dust collapse and lowers the primordial-black-hole formation threshold, but the quantitative shift and the derived bound on α are not actually computed.
Self-accelerating Soluti ons in Massive Gravity on Isotropic Reference Metric,
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Primordial Black Hole Formation in $f(R)=R+\alpha R^2$ Gravity: Perturbative and Non-Perturbative Analysis
The paper claims a positive R² curvature term accelerates dust collapse and lowers the primordial-black-hole formation threshold, but the quantitative shift and the derived bound on α are not actually computed.