Current cosmological constraints allow primordial black holes (PBHs) to constitute dark matter in the mass range of 10¹⁸-10²²g. We show that a major portion of this logarithmic window can be ruled-out based on the Solar System ephemeris, given that the external mass enclosed within 50 au from the Sun did not change by more than ~ 5× 10⁻¹⁴ solar masses per year in recent decades.
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Abraham Loeb (2024) studied this question.
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