Primordial-black-hole mergers in dark-matter spikes - Institut d'Astrophysique de Paris Accéder directement au contenu
Article Dans Une Revue Phys.Rev.D Année : 2019

Primordial-black-hole mergers in dark-matter spikes

Hiroya Nishikawa
  • Fonction : Auteur
Ely D. Kovetz
  • Fonction : Auteur
Marc Kamionkowski
  • Fonction : Auteur

Résumé

It has been suggested that primordial black holes (PBHs) of roughly 30 solar masses could make up the dark matter and if so, might account for the recent detections by LIGO involving binary black holes in this mass range. It has also been argued that the super-massive black holes (SMBHs) that reside at galactic centers may be surrounded by extremely-dense dark-matter (DM) spikes. Here we show that the rate for PBH mergers in these spikes may well exceed the merger rate considered before in galactic dark-matter halos, depending on the magnitudes of two competing effects on the DM spikes: depletion of PBHs due to relaxation and replenishment due to PBHs in loss cone. This may provide a plausible explanation for the current rate of detection of mergers of 30-solar-mass black holes, even if PBHs make up a subdominant contribution to the dark matter. The gravitational-wave signals from such events will always originate in galactic centers, as opposed to those from halos, which are expected to have little correlation with luminous-galaxy positions.

Mots clés

Fichier principal
Vignette du fichier
10.1103PhysRevD.99.043533.pdf (399.17 Ko) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-02051598 , version 1 (02-06-2023)

Identifiants

Citer

Hiroya Nishikawa, Ely D. Kovetz, Marc Kamionkowski, Joseph Silk. Primordial-black-hole mergers in dark-matter spikes. Phys.Rev.D, 2019, 99 (4), pp.043533. ⟨10.1103/PhysRevD.99.043533⟩. ⟨hal-02051598⟩
36 Consultations
43 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More