Papers › Primordial black hole formation in α-attractor models: an analysis using optimized peaks theory
Primordial black hole formation in α-attractor models: an analysis using optimized peaks theory
Rafid Mahbub
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In this paper, the formation of primordial black holes (PBHs) is reinvestigated using inflationary α-attractors. Instead of using the conventional Press-Schechter theory to compute the abundance, the optimized peaks theory is used, which was developed in Ref. \cite{Yoo:2018kvb,Yoo:2020dkz}. This method takes into account how curvature perturbations play a r\^{o}le in modifying the mass of primordial black holes. Analyzing the model proposed in \cite{Mahbub:2019uhl} it is seen that the horizon mass of the collapsed Hubble patch is larger by 𝒪(10) compared to the usual computation. Moreover, PBHs can be formed from curvature power spectrum, 𝒫_ζ(k), peaked at lower values using numerically favored threshold overdensities. As a result of the generally larger masses predicted, the peak of the power spectrum can be placed at larger k modes than that is typical with which potential future constraints on the primordial power spectrum through gravitational waves (GWs) can be evaded.
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