String Necklaces and Primordial Black Holes from Type IIB Strings

Abstract

We consider a model of static cosmic string loops in type IIB string theory, where the strings wrap cycles within the internal space. The strings are not topologically stabilised, however the presence of a lifting potential traps the windings giving rise to kinky cycloops. We find that PBH formation occurs at early times in a small window, whilst at late times we observe the formation of dark matter relics in the scaling regime. This is in stark contrast to previous predictions based on field theoretic models. We also consider the PBH contribution to the mass density of the universe, and use the experimental data to impose bounds on the string theory parameters.

45 pages, 9 figures, LaTeX; published version

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• Dark Stars and Gravitational Waves: Topical Review
• Evolution of Cosmic Necklaces and Lattices
• Non-topological Cycloops
• A Generalisation of the Nielsen-Olesen Vortex: Non-cylindrical strings in a modified Abelian-Higgs model
• Cosmic Strings Collision in Cosmological Backgrounds
• Evolution of FLRW spacetime after the birth of a cosmic string
• Can Superconducting Cosmic Strings Piercing Seed Black Holes Generate Supermassive Black Holes in the Early Universe?
• Gravitational Wave Signatures of Primordial Black Hole Reheating in Upcoming Interferometry Missions
• Cosmological Perturbations in Inflationary Models with Anisotropic Space-Time Scaling in Lifshitz Background
• Modelling Cosmic Springs with Finsler and Generalised Finsler Geometries