Excluding Primordial Black Holes as Dark Matter Based on Solar System Ephemeris

Abstract

Current cosmological constraints allow primordial black holes to constitute dark matter in the mass range of 10¹⁸–10²² g. I 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 M _⊙ yr⁻¹ in recent decades.