Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-04-06
JHEP0508:092,2005
Physics
High Energy Physics
High Energy Physics - Phenomenology
19 pages, 2 figures; minor updates, references added, submitted to JHEP
Scientific paper
10.1088/1126-6708/2005/08/092
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.
Avgoustidis Anastasios
Shellard Paul. E. S.
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