Constraints on the cosmic string loop collapse fraction from Primordial Black Holes

Abstract

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 $f<10^{-31}(G\mu /c^2{)}^{-3/2}$. 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

References in corpus (3)

• Do Evaporating Black Holes Form Photospheres?
• Cosmic Strings and Cosmic Superstrings
• An improved gamma-ray limit on the density of PBHs

Cited by in corpus (11)

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• PBH formation from spherically symmetric hydrodynamical perturbations: a review
• Primordial black hole formation with full numerical relativity
• Pinning down the primordial black hole formation mechanism with gamma-rays and gravitational waves
• Primordial black holes from cusp collapse on cosmic strings
• Rogue worlds meet the dark side: revealing terrestrial-mass primordial black holes with the Nancy Grace Roman Space Telescope
• Primordial Black Hole Formation in Non-Standard Post-Inflationary Epochs
• Primordial black holes: constraints, potential evidence and prospects
• Spinning Primordial Black Holes from First Order Phase Transition
• Primordial black hole isocurvature modes from non-Gaussianity
• No black holes from cosmic string cusps