Primordial black hole isocurvature modes from non-Gaussianity

Abstract

Primordial black holes (PBHs) are black holes that might have formed in high density regions in the early universe. The presence of local-type non-Gaussianity can lead to large-scale fluctuations in the PBH formation rate. If PBHs make up a non-negligible fraction of dark matter, these fluctuations can appear as isocurvature modes, and be used to constrain the amplitude of non-Gaussianity. Assuming that the parameters of non-Gaussianity are constant over all scales, we build upon the results of previous work by extending the calculation to include peaks theory and making use of the compaction $C$ for the formation criteria, accounting for non-linearities between $C$ and the curvature perturbation $\zeta$. For quadratic models of non-Gaussianity, our updated calculation gives constraints that are largely unaltered compared to those previously found, while for cubic models the constraints worsen significantly. In case all of the DM is made up of PBHs, the parameters of non-Gaussianity are $-2.9\cdot 10^{-4}<f<3.8\cdot 10^{-4}$ and $-1.5\cdot 10^{-3}<g<1.9\cdot 10^{-3}$ for quadratic and cubic models respectively.

23 pages, 7 figures

References in corpus (12)

• Primordial Black Holes as Dark Matter: Recent Developments
• Primordial black hole formation in the radiative era: investigation of the critical nature of the collapse
• Calculating the mass spectrum of primordial black holes
• Stochastic gravitational waves associated with the formation of primordial black holes
• Primordial non-gaussianity up to all orders: theoretical aspects and implications for primordial black hole models
• Separate Universes Do Not Constrain Primordial Black Hole Formation
• Primordial black holes as biased tracers
• Primordial black holes from scalar field evolution in the early universe
• Signatures of non-gaussianity in the isocurvature modes of primordial black hole dark matter
• Peaks and primordial black holes: the effect of non-Gaussianity
• Primordial black holes and gravitational waves from nonminimally coupled supergravity inflation
• Non-Gaussianity effects on the primordial black hole abundance for sharply-peaked primordial spectrum

Cited by in corpus (2)

• Primordial black holes from single-field inflation: a fine-tuning audit
• The Irrelevance of Primordial Black Hole Clustering in the LVK mass range