Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2012-01-23
Physics
High Energy Physics
High Energy Physics - Theory
34pp, 5 figs, companion paper to arXiv:1109.5121
Scientific paper
Cosmic super-strings interact generically with a tower of relatively light and/or strongly coupled Kaluza-Klein (KK) modes associated with the geometry of the internal space. In this paper, we study the production of spin-2 KK particles by cusps on loops of cosmic F- and D-strings. We consider cosmic super-strings localized either at the bottom of a warped throat or in a flat internal space with large volume. The total energy emitted by cusps in KK modes is comparable in both cases, although the number of produced KK modes may differ significantly. We then show that KK emission is constrained by the photo-dissociation of light elements and by observations of the diffuse gamma ray background. We study the resulting constraints on the parameter space of cosmic super-strings and highlight their complementarity with the regions that can be probed by current and upcoming gravitational wave experiments. KK modes are also expected to play an important role in the friction-dominated epoch of cosmic super-string evolution.
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