Cosmic Ray Positrons from Cosmic Strings

Abstract

We study the spectrum of cosmic ray positrons produced by a scaling distribution of non-superconducting cosmic strings. In this scenario, the positrons are produced from the jets which form from the cosmic string cusp annihilation process. The spectral shape is a robust feature of our scenario, and is in good agreement with the results from the recent PAMELA and ATIC experiments. In particular, the model predicts a sharp upper cutoff in the spectrum, and a flux which rises as the upper cutoff is approached. The energy at which the flux peaks is determined by the initial jet energy. The amplitude of the flux can be adjusted by changing the cosmic string tension and also depends on the cusp annihilation efficiency.

9 pages, 4 figures, 2 references added

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• Cosmic Strings and Superstrings
• Searching for Cosmic Strings in New Observational Windows
• Non-Thermal Production of WIMPs, Cosmic $e^{\pm }$ Excesses and $\gamma$-rays from the Galactic Center
• Boundarylike behaviors of the resonance interatomic energy in a cosmic string spacetime
• Cosmic Strings as Emitters of Extremely High Energy Neutrinos
• Vacuum energy in conical space with additional boundary conditions
• Ultra High Energy Neutrinos: Absorption, Thermal Effects and Signatures