Cosmic Ray Positrons from Cosmic Strings

2009/01/22 by Robert Brandenberger, Brandenberger, Robert, Yi-Fu Cai +5 · 1 citation
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Dark Matter and Cosmic Phenomena #Particle physics theoretical and experimental studies #astro-ph.HE #gr-qc #hep-ph #hep-th

paper · pdf · doi:10.48550/arxiv.0901.3474

9 pages, 4 figures, 2 references added

arxiv created 2009/01/25 · arxiv updated 2009/12/01

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.

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• Nonthermal production of WIMPs, cosmice±excesses, andγrays from the Galactic Center

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