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Constraints on primordial black holes from observation of stars in dwarf galaxies

par Esser, Nicolas ;Tiniakov, Petr
Référence Physical Review D, 107, 10, 103052
Publication Publié, 2023-05-01

Article révisé par les pairs

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Résumé :

We propose a way to constrain the primordial black hole (PBH) abundance in the range of PBH masses m around 1020 g based on their capture by Sun-like stars in dwarf galaxies, with subsequent star destruction. We calculate numerically the probability of a PBH capture by a star at the time of its formation in an environment typical of dwarf galaxies. Requiring that no more than a fraction ζ of stars in a dwarf galaxy is destroyed by PBHs translates into an upper limit on the PBH abundance. For the parameters of Triangulum II and ζ=0.5, we find that no more than ∼35% of dark matter can consist of PBHs in the mass range 1018-(a few)×1021 g. The constraints depend strongly on the parameter ζ and may significantly improve if smaller values of ζ are established from observations. An accurate determination of ζ from dwarf galaxy modeling is thus of major importance.