Constraints on the cosmic string loop collapse fraction from Primordial Black Holes
Cosmology and Nongalactic Astrophysics
2020-07-01 v2 High Energy Physics - Phenomenology
Abstract
A small fraction, , of cosmic string loops can collapse to form Primordial Black Holes (PBHs). Constraints on the abundance of PBHs can therefore be used to constrain . We update these calculations, taking into account the PBH extended mass function, and find . This is roughly two orders of magnitude tighter than previous constraints. The improvement from the tighter constraints on the abundance of PBHs is partly off-set by refinements to the theoretical calculation of the cosmic string loop formation rate.
Keywords
Cite
@article{arxiv.1911.12658,
title = {Constraints on the cosmic string loop collapse fraction from Primordial Black Holes},
author = {Chloe James-Turner and Danton P. B. Weil and Anne M. Green and Edmund J. Copeland},
journal= {arXiv preprint arXiv:1911.12658},
year = {2020}
}
Comments
5 pages, v2: takes into account only a fraction of string network energy goes into long loops, constraints consequently weakened by one order of magnitude (thank you to referee for pointing this out) + other minor changes