PIRSA:26040116 Conference Cosmology

DOI10.48660/26040116

Conference/School: Cosmological Frontiers in Fundamental Physics 2026

Erfani, E. (2026). Hierarchical Merger of Primordial Black Holes and Gravitational Waves. Perimeter Institute. https://pirsa.org/26040116

Erfani, Encieh. Hierarchical Merger of Primordial Black Holes and Gravitational Waves. Perimeter Institute, Apr. 27, 2026, https://pirsa.org/26040116 

@misc{ pirsa_PIRSA:26040116,
  doi = {10.48660/26040116},
  url = {https://pirsa.org/26040116},
  author = {Erfani, Encieh},
  keywords = {Cosmology},
  language = {en},
  title = {Hierarchical Merger of Primordial Black Holes and Gravitational Waves},
  publisher = {Perimeter Institute},
  year = {2026},
  month = {apr},
  note = {PIRSA:26040116 see, \url{https://pirsa.org}}
}

Abstract

In this talk, I will present our study of primordial black holes (PBHs) as a candidate for dark matter in the dense cores of dwarf galaxies. Assuming an initially monochromatic PBH population, we investigate their dynamical evolution and hierarchical merger history within a Hubble time. We show that repeated mergers can efficiently build higher-generation BHs. I will then discuss the stochastic gravitational wave background (SGWB) produced through both hierarchical binary BH mergers and close hyperbolic encounters. While binary mergers dominate the overall emission, hyperbolic encounters generate earlier signals and contribute a continuous subdominant background. Finally, I will compare the predicted spectra with the sensitivities of current and future GW observatories, highlighting the potential of these signals to probe PBH dark matter in dwarf galaxies.

Resources

1/12
1/12
2/12
2/12
3/12
3/12
4/12
4/12
5/12
5/12
6/12
6/12
7/12
7/12
8/12
8/12
9/12
9/12
10/12
10/12
11/12
11/12
12/12
12/12

Next talk

Related Talks