Pitfalls of a power-law parametrization of the primordial power spectrum for primordial black hole formation

Green, Anne M.

Abstract

Primordial Black Holes (PBHs) can form in the radiation dominated early Universe from the collapse of large density perturbations produced by inflation. A power-law parameterisation of the primordial power spectrum is often used to extrapolate from cosmological scales, where the amplitude of the perturbations is well-measured by Cosmic Microwave Background and Large Scale Structure observations, down to the small scales on which PBHs may form. We show that this typically leads to large errors in the amplitude of the fluctuations on small scales, and hence extremely inaccurate calculations of the abundance of PBHs formed.

Citation

Green, A. M. (2018). Pitfalls of a power-law parametrization of the primordial power spectrum for primordial black hole formation. Physical Review D, 98(2), https://doi.org/10.1103/PhysRevD.98.023529

• Journal Article Type: Article
• Acceptance Date: Jun 27, 2018
• Publication Date: Jul 24, 2018
• Deposit Date: Jul 25, 2018
• Publicly Available Date: Jul 25, 2018
• Journal: Physical Review D
• Print ISSN: 2470-0010
• Electronic ISSN: 2470-0029
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 98
• Issue: 2
• DOI: https://doi.org/10.1103/PhysRevD.98.023529
• Public URL: https://nottingham-repository.worktribe.com/output/947879
• Publisher URL: https://journals.aps.org/prd/abstract/10.1103/PhysRevD.98.023529
• Contract Date: Jul 25, 2018