Constraints on the cosmic string loop collapse fraction from Primordial Black Holes
| Autor: | Anne M. Green, Chloe James-Turner, Edmund J. Copeland, Danton P. B. Weil |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Cosmic string
Physics High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics (astro-ph.CO) High Energy Physics - Phenomenology (hep-ph) FOS: Physical sciences Primordial black hole Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Formation rate Order of magnitude Astrophysics - Cosmology and Nongalactic Astrophysics |
| Popis: | A small fraction, $f$, of cosmic string loops can collapse to form Primordial Black Holes (PBHs). Constraints on the abundance of PBHs can therefore be used to constrain $f$. We update these calculations, taking into account the PBH extended mass function, and find $f < 10^{-31} (G ��/ c^2)^{-3/2}$. 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. 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 |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|