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Constraints on Primordial Black Hole abundance from capture by main sequence stars

par Esser, Nicolas
Président du jury Mognetti, Bortolo Matteo
Promoteur Tiniakov, Petr
Publication Non publié, 2022-06-07

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Résumé :

There are multiple observational evidences of the existence of dark matter (DM), and still little is known about its nature. A promising dark matter candidate are Primordial Black Holes (PBHs), a theoretical model of black holes created in the early Universe. There exist several constraints on the abundance of DM arising from the study of various astrophysical phenomena and observations. In the case of PBHs, such constraints can be derived from the study of their gravitational interactions with stars. If a PBH gets captured by a star, the latter will then be accreted onto the black hole and disappear. Hence, the very existence of stars imposes that the probability of such a capture is small and puts limits on the abundance of PBHs. The aim of this thesis is to derive new constraints on the abundance of Primordial Black Holes, based on the capture probability of the PBHs by main sequence stars.