The merger rate of primordial black holes depends on their initial clustering. In the absence of primordial non-Gaussianity correlating short and large scales, primordial black holes are distributed à la Poisson at the time of their formation. However, primordial non-Gaussianity of the local type may correlate primordial black holes on large scales. We show that future experiments looking for cosmic microwave background μ distortion would test the hypothesis of initial primordial black hole clustering induced by local non-Gaussianity, while existing limits already show that significant non-Gaussianity is necessary to induce primordial black hole clustering.
Constraining the initial primordial black hole clustering with CMB distortion / De Luca, V.; Franciolini, G.; Riotto, A.. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 104:6(2021). [10.1103/PhysRevD.104.063526]
Constraining the initial primordial black hole clustering with CMB distortion
Franciolini G.;Riotto A.
2021
Abstract
The merger rate of primordial black holes depends on their initial clustering. In the absence of primordial non-Gaussianity correlating short and large scales, primordial black holes are distributed à la Poisson at the time of their formation. However, primordial non-Gaussianity of the local type may correlate primordial black holes on large scales. We show that future experiments looking for cosmic microwave background μ distortion would test the hypothesis of initial primordial black hole clustering induced by local non-Gaussianity, while existing limits already show that significant non-Gaussianity is necessary to induce primordial black hole clustering.File | Dimensione | Formato | |
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De Luca_Constraining the initial primordial_2021.pdf
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