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Kiefer C. Quantum gravity

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PRIMORDIAL BLACK HOLES 241<br />

Table 7.2 Constraints on the mass fraction α(M) ≡ ρPBH,M<br />

ρ r<br />

≈ Ω PBH,M of<br />

primordial black holes at their time of formation (Green and Liddle 1997)<br />

Constraint Range Reason<br />

1. α

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