Gravitational Wave Anisotropies from Primordial Black Holes
Cosmology and Nongalactic Astrophysics2020-03-10v2General Relativity and Quantum CosmologyHigh Energy Physics - PhenomenologyHigh Energy Physics - Theory
An observable stochastic background of gravitational waves is generated whenever primordial black holes are created in the early universe thanks to a small-scale enhancement of the curvature perturbation. We calculate the anisotropies and non-Gaussianity of such stochastic gravitational waves background which receive two contributions, the first at formation time and the second due to propagation effects. The former contribution can be generated if the distribution of the curvature perturbation is characterized by a local and scale-invariant shape of non-Gaussianity. Under such an assumption, we conclude that a sizeable magnitude of anisotropy and non-Gaussianity in the gravitational waves would suggest that primordial black holes may not comply the totality of the dark matter.
@article{arxiv.1909.12619,
title = {Gravitational Wave Anisotropies from Primordial Black Holes},
author = {N. Bartolo and D. Bertacca and V. De Luca and G. Franciolini and S. Matarrese and M. Peloso and A. Ricciardone and A. Riotto and G. Tasinato},
journal= {arXiv preprint arXiv:1909.12619},
year = {2020}
}