Cycloops: Dark Matter or a Monopole Problem for Brane Inflation?

Abstract

We consider cosmic loop production by long string interactions in cosmological models with compact extra dimensions. In the case that the compact manifold is not simply connected, we focus on the possibility of loops wrapping around non-trivial cycles and becoming topologically trapped. Such loops, denoted cycloops, behave like matter in the radiation era, posing a potential monopole problem. We calculate the number distribution and the energy density of these objects as functions of cosmic time and use them to study cosmological constraints imposed on simple brane inflation models. For typical choices of parameters we find that to avoid cycloop domination before the matter-radiation transition, the strings must be unacceptably light, namely $G\mu <10^{-18}$, unless some mechanism to dilute the cycloops is provided. By exploring the full parameter space however, we are able to find models with $G\mu \sim 10^{-14}$, which is marginally consistent with brane inflation. In such models the cycloop could provide an interesting dark matter candidate.

19 pages, 2 figures; minor updates, references added, submitted to JHEP

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• Generating the curvature perturbation with instant preheating
• Primordial black holes from cosmic necklaces
• Brane inflation without slow-roll
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• Non-topological Cycloops
• A Generalisation of the Nielsen-Olesen Vortex: Non-cylindrical strings in a modified Abelian-Higgs model
• Cosmic strings with twisted magnetic flux lines and wound-strings in extra dimensions
• Can Superconducting Cosmic Strings Piercing Seed Black Holes Generate Supermassive Black Holes in the Early Universe?
• Non-Relativistic Strings in Expanding Spacetime
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