Journal of Cosmology and Astroparticle Physics
Journal of Cosmology and Astroparticle Physics
5 years ago

Extreme scenarios: the tightest possible constraints on the power spectrum due to primordial black holes

Christian T. Byrnes, Philippa S. Cole
Observational constraints on the abundance of primordial black holes (PBHs) constrain the allowed amplitude of the primordial power spectrum on both the smallest and the largest ranges of scales, covering over 20 decades from 1−10 20 / Mpc. Despite tight constraints on the allowed fraction of PBHs at their time of formation near horizon entry in the early Universe, the corresponding constraints on the primordial power spectrum are quite weak, typically ##IMG## [http://ej.iop.org/icons/Entities/calP.gif] {Script P} R ##IMG## [http://ej.iop.org/icons/Entities/lesssim.gif] {lesssim} 10 −2 assuming Gaussian perturbations. Motivated by recent claims that the evaporation of just one PBH would destabilise the Higgs vacuum and collapse the Universe, we calculate the constraints which follow from assuming there are ze...

Publisher URL: http://iopscience.iop.org/1475-7516/2018/02/019

DOI: 10.1088/1475-7516/2018/02/019

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