Cosmic super-strings and Kaluza-Klein modes

Abstract

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 show that this rules out regions of the parameter space of cosmic super-strings that are complementary to 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.

Discrete gauge symmetry and Aharonov-Bohm radiation in string theory

“…The constraint is given by the cascade energy density accumulated up to the present age, [46][47][48][49],…”

“…Before this time, produced photos are absorbed by the cosmological medium. Here, we assume t cas O(10 14∼15 )[s], following [46][47][48][49].…”

Radiation of supersymmetric particles from Aharonov-Bohm R-string

“…We can proceed the study along the lines of [30,31]. If muons or photons are radiated, the light elements formed by BBN will be destroyed.…”

“…The loop number density of cosmic strings that loose the energy through two types of radiation was discussed in the literatures [24][25][26][29][30][31][32]. Among them, the discussion shown in [24] offers a transparent treatment of two kinds of emissions.…”

Big-bang nucleosynthesis and gamma-ray constraints on cosmic strings with a large Higgs condensate

“…[15,[25][26][27][28][29] and the emission of Kaluza-Klein particles by cosmic superstrings was analyzed in Refs. [30,31]. Emission of particles by loops of "thick" string (whose width is TeV scale rather than GUT scale) was studied in [32].…”