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

Green, Anne M. (2018) Pitfalls of a power-law parametrization of the primordial power spectrum for primordial black hole formation. Physical Review D, 98 (2). 023529. ISSN 2470-0029

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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.

Item Type: Article
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Physics and Astronomy
Identification Number: https://doi.org/10.1103/PhysRevD.98.023529
Depositing User: Green, Anne
Date Deposited: 25 Jul 2018 13:10
Last Modified: 27 Jul 2018 10:00
URI: http://eprints.nottingham.ac.uk/id/eprint/53144

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