Detectability of Gravitational Waves from the Coalescence of Massive Primordial Black Holes with Initial Clustering

Qianhang Ding , Tomohiro Nakama , Joseph Silk (1) , Yi Wang

1 IAP - Institut d'Astrophysique de Paris

We show that the effect of initial non-Gaussian clustering can significantly enhance the event rate for primordial black hole (PBH) coalescence. The impact of such clustering is studied in a specific scenario of multistream inflation. Initial clustering enables the possibility of detecting massive PBH coalescence by space-based gravitational-wave interferometers such as LISA and DECIGO/BBO. The parameter regime for the ground-based detectors to detect PBH coalescence is also extended.

Mots clés: Astrophysics and astroparticle physics; black hole: primordial; black hole: coalescence; black hole; gravitational radiation: emission; gravitational radiation detector; gravitational radiation: direct detection; non-Gaussianity; interferometer; inflation; LISA

Domaines: Astrophysique [astro-ph]; Relativité Générale et Cosmologie Quantique [gr-qc]; Physique des Hautes Energies - Théorie [hep-th]

Qianhang Ding, Tomohiro Nakama, Joseph Silk, Yi Wang. Detectability of Gravitational Waves from the Coalescence of Massive Primordial Black Holes with Initial Clustering. Physical Review D, 2019, 100 (10), pp.103003. ⟨10.1103/PhysRevD.100.103003⟩. ⟨hal-02088889⟩