Author:
van Laak Raphaël,Young Sam
Abstract
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 ζ. 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 · 10-4 < f < 3.8 · 10-4 and
-1.5 · 10-3 < g < 1.9 · 10-3 for quadratic and cubic models respectively.
Subject
Astronomy and Astrophysics
Cited by
1 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献