Dark matter production from cosmic necklaces

Abstract

Cosmic strings have gained a great interest, since they are formed in a large class of brane inflationary models. The most interesting story is that cosmic strings in brane models are distinguished in future cosmological observations. If the strings in brane models are branes or superstrings that can move along compactified space, and also if there are degenerated vacua along the compactified space, kinks interpolate between degenerated vacua become ``beads'' on the strings. In this case, strings turn into necklaces. In the case that the compact manifold in not simply connected, a string loop that winds around a nontrivial circle is stable due to the topological reason. Since the existence of the (quasi-)degenerated vacua and the nontrivial circle is a common feature of the brane models, it is important to study cosmological constraints on the cosmic necklaces and the stable winding states. In this paper, we consider dark matter production from loops of the cosmic necklaces. Our result suggests that necklaces can put stringent bound on certain kinds of brane models.

27 pages, 5 figures, added many comments and 3 figures, accepted for publication in JCAP

References in corpus (4)

• Overproduction of cosmic superstrings
• Topological Curvatons
• Brane necklaces and brane coils
• Formation of monopoles and domain walls after brane inflation

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• Monopole annihilation in cosmic necklaces
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• String Necklaces and Primordial Black Holes from Type IIB Strings
• Primordial black holes from monopoles connected by strings
• Remote Inflation: Hybrid-like inflation without hybrid-type potential
• Non-topological Cycloops
• Future targets for light gauge bosons from cosmic strings
• A Generalisation of the Nielsen-Olesen Vortex: Non-cylindrical strings in a modified Abelian-Higgs model
• Can Superconducting Cosmic Strings Piercing Seed Black Holes Generate Supermassive Black Holes in the Early Universe?
• Graviton production from D-string recombination and annihilation
• Casimir force for cosmological domain walls